PostBuildAction to Remove Mobile Warning in WebGL builds

RemoveMobileWarningWebGL.cs

using System.IO;
using UnityEditor;
using UnityEditor.Callbacks;

public class RemoveMobileWarningWebGL
{
	private const string JS_EXTENSION = ".js";

	[PostProcessBuild]
	public static void OnPostProcessBuild(BuildTarget target, string targetPath)
	{
		if (target == BuildTarget.WebGL)
		{
			RemoveWebGLWarning(targetPath);
		}
	}

	private static void RemoveWebGLWarning(string targetPath)
	{
		var filePath = FindWebGLJSAutogenerated(targetPath);

		var text = File.ReadAllText(filePath);
		text = text.Replace("UnityLoader.SystemInfo.mobile", "false");
		File.WriteAllText(filePath, text);
	}

	private static string FindWebGLJSAutogenerated(string targetPath)
	{
		var buildPath = Path.Combine(targetPath, "Build");
		foreach (var filePath in Directory.GetFiles(buildPath))
		{
			if (IsJavascriptFile(filePath))
			{
				return filePath;
			}
		}

		throw new System.Exception("Can't find Javascript file!");
	}

	private static bool IsJavascriptFile(string filePath)
	{
		return Path.GetExtension(filePath).ToLowerInvariant().Equals(JS_EXTENSION);
	}
}