gistfile1.ps1

function Break-SPWebInheritance($siteXmlFilePath) {
    $xml = Select-Xml -Path $siteXmlFilePath -XPath"//SiteStructure"
    $xml.Node.Web | ForEach-Object {
        Write-Host "Openning web for breaking inheritance ($($_.Url))"
        $web = $clientContext.Site.OpenWeb($_.Url)
        $web.BreakRoleInheritance($true, $true)
        $clientContext.ExecuteQuery()
    }
}