Revert of [Extension ServiceWorkers] Blink: Passing v8::context to extensions dispatcher

Source/core/workers/WorkerReportingProxy.h

Index: Source/core/workers/WorkerReportingProxy.h
diff --git a/Source/core/workers/WorkerReportingProxy.h b/Source/core/workers/WorkerReportingProxy.h
index 448c7786b6a63d8038f89c85b05ede9ecbe01e51..85e880654140531c24a92b6a02a4cf1c27594f8c 100644
--- a/Source/core/workers/WorkerReportingProxy.h
+++ b/Source/core/workers/WorkerReportingProxy.h
@@ -55,9 +55,6 @@
     // evaluation completed with no uncaught exception.
     virtual void didEvaluateWorkerScript(bool success) = 0;
 
-    // Invoked when the thread creates a worker script context.
-    virtual void didInitializeWorkerContext() { }
-
     // Invoked when the new WorkerGlobalScope is started.
     virtual void workerGlobalScopeStarted(WorkerGlobalScope*) = 0;