Change WokerThread to use a blink::WebThread.

Source/web/WebWorkerRunLoop.cpp

Index: Source/web/WebWorkerRunLoop.cpp
diff --git a/Source/web/WebWorkerRunLoop.cpp b/Source/web/WebWorkerRunLoop.cpp
index aa61bd8fa40589780823f8d14b05e82a71dfdbac..8b5a1be74952cf1c25d038bb6dddb0e89e53f3a4 100644
--- a/Source/web/WebWorkerRunLoop.cpp
+++ b/Source/web/WebWorkerRunLoop.cpp
@@ -25,7 +25,7 @@
 #include "config.h"
 #include "public/platform/WebWorkerRunLoop.h"
 
-#include "core/workers/WorkerRunLoop.h"
+#include "core/dom/ExecutionContextTask.h"
 
 using namespace blink;
 
@@ -63,7 +63,8 @@ WebWorkerRunLoop::WebWorkerRunLoop(WorkerRunLoop* workerRunLoop)
 
 bool WebWorkerRunLoop::postTask(Task* task)
 {
-    return m_workerRunLoop->postTask(TaskForwarder::create(adoptPtr(task)));
+    ASSERT(false);
+    return false;
 }
 
 bool WebWorkerRunLoop::equals(const WebWorkerRunLoop& o) const