Remove did(Start|Stop)WorkerThread as it is not used.

Source/bindings/core/v8/WorkerScriptController.cpp

Index: Source/bindings/core/v8/WorkerScriptController.cpp
diff --git a/Source/bindings/core/v8/WorkerScriptController.cpp b/Source/bindings/core/v8/WorkerScriptController.cpp
index 9d5389fc8b45ef9620830d01ea26d9b1a018cded..8887222646d2535205137f945b328806d566f8d3 100644
--- a/Source/bindings/core/v8/WorkerScriptController.cpp
+++ b/Source/bindings/core/v8/WorkerScriptController.cpp
@@ -149,7 +149,7 @@ WorkerScriptController::~WorkerScriptController()
 
     m_world->dispose();
 
-    // The corresponding call to didStartWorkerThread is in
+    // The corresponding call to didStartWorkerRunLoop is in
     // WorkerThread::initialize().
     // See http://webkit.org/b/83104#c14 for why this is here.
     blink::Platform::current()->didStopWorkerRunLoop(blink::WebWorkerRunLoop(m_workerGlobalScope.thread()));