This runs through any / all web content resource objects and cycles through the historical versions of each, deleting any that are not the latest.

lr62-delete-web-content-versions.groovy

import com.liferay.portal.service.ServiceContext
import com.liferay.portlet.journal.service.JournalArticleServiceUtil
import com.liferay.portlet.journal.service.JournalArticleResourceLocalServiceUtil
import java.util.List

import com.liferay.portal.kernel.dao.orm.ActionableDynamicQuery
import com.liferay.portal.kernel.exception.PortalException
import com.liferay.portal.kernel.exception.SystemException
import com.liferay.portal.util.PropsValues

import com.liferay.portlet.journal.service.persistence.JournalArticleResourceActionableDynamicQuery
import com.liferay.portlet.journal.service.JournalArticleServiceUtil
import com.liferay.portlet.journal.service.JournalArticleLocalServiceUtil


previewMode = true;

if(previewMode) {
  out.println(
    """<div class="portlet-msg-alert">Preview mode is on: switch off the flag and execute this script 
    again to make changes to the database</div>""")
}

def SCRIPT_ID = "Delete-Web-Content-Versions"

outputFile = new File(
  """${System.getProperty("liferay.home")}/scripting/out-${SCRIPT_ID}.txt""")

outputFile.getParentFile().mkdirs()

def trace(message) {
  out.println(message)
  outputFile << "${message}\n"
}

int articlesResourcesCount = JournalArticleResourceLocalServiceUtil.getJournalArticleResourcesCount();

    println('Total articles to process: ' + articlesResourcesCount)

//Retrieve the JournalArticleResources:

  articles = JournalArticleResourceLocalServiceUtil.getJournalArticleResources(0,100);

        for( i=0; i< articles.size() ; i++){
           article = articles[i]
           long aGI = article.groupId
           //println('article groupId=' + aGI)
           String ai = article.getArticleId()
           //println('The articleId=' + ai)
           articleversions = JournalArticleServiceUtil.getArticlesByArticleId(aGI,ai, -1, -1, null)
              for(x=0; x< articleversions.size() ; x++){
                try{ 
                  articleversion = articleversions[x]
                  long apk = articleversion.getResourcePrimKey()
                  latestversion = JournalArticleServiceUtil.getLatestArticle(apk)
                  trace('This articleId ' + articleversion.id + ' with ResourcePrimKey of ' + articleversion.getResourcePrimKey() + ' has version of ' + articleversion.version)
                  trace('The latest version has articleId of ' + latestversion.id + ' and ResourcePrimKey of ' + latestversion.getResourcePrimKey() + ' has version of ' + latestversion.version)
                    if(articleversion.version != latestversion.version){
                          trace('Looks like we should delete version: ' + articleversion.version + ' with GroupId=' + articleversion.groupId + ' with articleId=' + articleversion.articleId );
                            if(!previewMode) {
                            JournalArticleLocalServiceUtil.deleteArticle(articleversion.groupId, articleversion.articleId, articleversion.version, null, null);
                            }
                        }
                    } catch (Exception e1) {
                    println(e1)
                    e1.printStackTrace(out)
                  }

                }

        }

import com.liferay.portal.service.ServiceContext
import com.liferay.portlet.journal.service.JournalArticleServiceUtil
import com.liferay.portlet.journal.service.JournalArticleResourceLocalServiceUtil
import java.util.List

import com.liferay.portal.kernel.dao.orm.ActionableDynamicQuery
import com.liferay.portal.kernel.exception.PortalException
import com.liferay.portal.kernel.exception.SystemException
import com.liferay.portal.util.PropsValues

import com.liferay.portlet.journal.service.persistence.JournalArticleResourceActionableDynamicQuery
import com.liferay.portlet.journal.service.JournalArticleServiceUtil
import com.liferay.portlet.journal.service.JournalArticleLocalServiceUtil

previewMode = true;

if(previewMode) {
out.println(
"""

Preview mode is on: switch off the flag and execute this script
again to make changes to the database

""")
}

def SCRIPT_ID = "Delete-Web-Content-Versions"

outputFile = new File(
"""${System.getProperty("liferay.home")}/scripting/out-${SCRIPT_ID}.txt""")

outputFile.getParentFile().mkdirs()

def trace(message) {
out.println(message)
outputFile << "${message}\n"
}

int articlesResourcesCount = JournalArticleResourceLocalServiceUtil.getJournalArticleResourcesCount();

println('Total de articulos a examinar: ' + articlesResourcesCount)

//Retrieve the JournalArticleResources:

articles = JournalArticleResourceLocalServiceUtil.getJournalArticleResources(0,100);

    for( i=0; i< articles.size() ; i++){
       article = articles[i]
       long aGI = article.groupId
       String ai = article.getArticleId()
       articleversions = JournalArticleServiceUtil.getArticlesByArticleId(aGI,ai, -1, -1, null)
          for(x=0; x< articleversions.size() ; x++){
            try{ 
              articleversion = articleversions[x]
              long apk = articleversion.getResourcePrimKey()
              latestversion = JournalArticleServiceUtil.getLatestArticle(apk)
               if(articleversion.version != latestversion.version){
					  trace('La ultima version de este articleId  ' + latestversion.id + ' con  ResourcePrimKey ' + latestversion.getResourcePrimKey() + ' es ' + latestversion.version)
					  trace('Esta versión sera borrada:');
                      trace(' articleId ' + articleversion.id + ' con ResourcePrimKey No. ' + articleversion.getResourcePrimKey() + ' tiene una version ' + articleversion.version)
					if(!previewMode) {
                         JournalArticleLocalServiceUtil.deleteArticle(articleversion.groupId, articleversion.articleId, articleversion.version, null, null);
                        }
                    }
                } catch (Exception e1) {
                println(e1)
                e1.printStackTrace(out)
              }

            }

    }