(WONT COMMIT) BackgroundSync: Run WebCallbacks::onSuccess indirectly

content/child/background_sync/background_sync_provider_thread_proxy.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/child/background_sync/background_sync_provider_thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_local.h"
 #include "content/child/background_sync/background_sync_provider.h"
 
 using base::LazyInstance;
 using base::ThreadLocalPointer;
 
 namespace content {
 
 namespace {
 
+template <typename S, typename T>
+void RunOnSuccess(scoped_ptr<blink::WebCallbacks<S, T>> callbacks, S* results) {
+  callbacks->onSuccess(results);
+}
+
 // CallbackThreadAdapter<S,T> is a wrapper for WebCallbacks<S,T> which
 // switches to a specific thread before calling the wrapped callback's
 // onSuccess or onError methods.
 //
 // Takes ownership of the WebCallbacks object which it wraps.
 template <typename S, typename T>
 class CallbackThreadAdapter : public blink::WebCallbacks<S, T> {
  public:
   CallbackThreadAdapter(scoped_ptr<blink::WebCallbacks<S, T>> callbacks,
                         int worker_thread_id)
       : worker_thread_id_(worker_thread_id) {
     callbacks_.reset(callbacks.release());
   }
 
   virtual void onSuccess(S* results) {
     // If the worker thread has been destroyed, then this task will be
     // silently discarded.
     WorkerTaskRunner::Instance()->PostTask(
         worker_thread_id_,
-        base::Bind(&blink::WebCallbacks<S, T>::onSuccess,
-                   base::Owned(callbacks_.release()), results));
+        base::Bind(&RunOnSuccess<S, T>, base::Passed(callbacks_.Pass()),
+                   results));
   }
 
   virtual void onError(T* error) {
     // If the worker thread has been destroyed, then this task will be
     // silently discarded.
     WorkerTaskRunner::Instance()->PostTask(
         worker_thread_id_,
         base::Bind(&blink::WebCallbacks<S, T>::onError,
                    base::Owned(callbacks_.release()), error));
   }
@@ skipping 122 matching lines @@
     : main_thread_task_runner_(main_thread_task_runner),
       sync_provider_(sync_provider) {
   g_sync_provider_tls.Pointer()->Set(this);
 }
 
 BackgroundSyncProviderThreadProxy::~BackgroundSyncProviderThreadProxy() {
   g_sync_provider_tls.Pointer()->Set(nullptr);
 }
 
 }  // namespace content