Drop V8RecursionScope dependency on ExecutionContext

Source/core/workers/WorkerThread.cpp

Index: Source/core/workers/WorkerThread.cpp
diff --git a/Source/core/workers/WorkerThread.cpp b/Source/core/workers/WorkerThread.cpp
index 988256e367b9a256b1245ff2fdac409fb9aa786d..a4ca7f659701a582a936b07b4006f989561e98bc 100644
--- a/Source/core/workers/WorkerThread.cpp
+++ b/Source/core/workers/WorkerThread.cpp
@@ -286,7 +286,6 @@ void WorkerThread::initialize()
 
 void WorkerThread::cleanup()
 {
-
     // This should be called before we start the shutdown procedure.
     workerReportingProxy().willDestroyWorkerGlobalScope();
 
@@ -337,6 +336,8 @@ public:
     virtual void performTask(ExecutionContext *context)
     {
         WorkerGlobalScope* workerGlobalScope = toWorkerGlobalScope(context);
+
+        V8PerIsolateData::willBeDestroyed(workerGlobalScope->script()->isolate());

[haraken, 2014/09/11 01:18:54]

Can we call this in WorkerThread::cleanup()? We want to call
V8PerIsolateData::willBeDestroyed at the very end of the thread execution but
before starting detaching the thread.

         workerGlobalScope->clearInspector();
         // It's not safe to call clearScript until all the cleanup tasks posted by functions initiated by WorkerThreadShutdownStartTask have completed.
         workerGlobalScope->clearScript();