Reviewed by Darin Adler.
        
        Fixed <rdar://problem/5348384> Restore old return value behavior of 
        stringByEvaluatingJavaScriptFromString
        
        Return an empty string unless you have a string, boolean, or number
        result.

        * WebCore.xcodeproj/project.pbxproj:
        * page/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge stringByEvaluatingJavaScriptFromString:forceUserGesture:]):

WebKitTools:

        Reviewed by Darin Adler.
        
        Updated DumpRenderTree for <rdar://problem/5348384> Restore old return 
        value behavior of stringByEvaluatingJavaScriptFromString

        * DumpRenderTree/DumpRenderTree.m:
        (testStringByEvaluatingJavaScriptFromString):
        * DumpRenderTree/DumpRenderTree.xcodeproj/project.pbxproj:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24456 268f45cc-cd09-0410-ab3c-d52691b4dbfc