Turn WorkerLoaderProxy into a threadsafe, ref-counted object.

Source/web/WebSharedWorkerImpl.h

Index: Source/web/WebSharedWorkerImpl.h
diff --git a/Source/web/WebSharedWorkerImpl.h b/Source/web/WebSharedWorkerImpl.h
index 92df5f1263bf0d2f3aad2c7dc007b54fd5ab2523..a8fa786ce9f3ac3d85ad4eb315e8f03ebc4e00d3 100644
--- a/Source/web/WebSharedWorkerImpl.h
+++ b/Source/web/WebSharedWorkerImpl.h
@@ -44,7 +44,6 @@
 #include "public/web/WebSharedWorkerClient.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
-#include "wtf/WeakPtr.h"
 
 namespace blink {
 
@@ -63,10 +62,10 @@ class WorkerInspectorProxy;
 // convert to Chrome data types first and then call the supplied WebCommonWorkerClient.
 class WebSharedWorkerImpl final
     : public WorkerReportingProxy
-    , public WorkerLoaderProxy
     , public WebFrameClient
     , public WebSharedWorker
-    , public WebDevToolsAgentClient {
+    , public WebDevToolsAgentClient
+    , private WorkerLoaderProxyProvider {
 public:
     explicit WebSharedWorkerImpl(WebSharedWorkerClient*);
 
@@ -82,10 +81,6 @@ public:
     virtual void workerThreadTerminated() override;
     virtual void willDestroyWorkerGlobalScope() override { }
 
-    // WorkerLoaderProxy methods:
-    virtual void postTaskToLoader(PassOwnPtr<ExecutionContextTask>) override;
-    virtual bool postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>) override;
-
     // WebFrameClient methods to support resource loading thru the 'shadow page'.
     virtual WebApplicationCacheHost* createApplicationCacheHost(WebLocalFrame*, WebApplicationCacheHostClient*) override;
     virtual void didFinishDocumentLoad(WebLocalFrame*) override;
@@ -133,6 +128,10 @@ private:
 
     void postMessageToPageInspectorOnMainThread(const String& message);
 
+    // WorkerLoaderProxyProvider
+    void postTaskToLoader(PassOwnPtr<ExecutionContextTask>);
+    bool postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>);
+
     // 'shadow page' - created to proxy loading requests from the worker.
     RefPtrWillBePersistent<ExecutionContext> m_loadingDocument;
     WebView* m_webView;
@@ -156,6 +155,9 @@ private:
 
     // Kept around only while main script loading is ongoing.
     OwnPtr<Loader> m_mainScriptLoader;
+
+    RefPtr<WorkerLoaderProxy> m_loaderProxy;
+
     WebURL m_url;
     WebString m_name;
     WebString m_contentSecurityPolicy;
@@ -164,4 +166,4 @@ private:
 
 } // namespace blink
 
-#endif
+#endif // WebSharedWorkerImpl_h