[components/policy] Use ThreadTaskRunnerHandle instead of LoopProxy

components/policy/core/common/async_policy_provider.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_
 #define COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_
 
 #include "base/cancelable_callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "components/policy/core/common/configuration_policy_provider.h"
 #include "components/policy/policy_export.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace policy {
 
 class AsyncPolicyLoader;
 class PolicyBundle;
 class SchemaRegistry;
 
 // A policy provider that loads its policies asynchronously on a background
 // thread. Platform-specific providers are created by passing an implementation
@@ skipping 15 matching lines @@
 
  private:
   // Helper for RefreshPolicies().
   void ReloadAfterRefreshSync();
 
   // Invoked with the latest bundle loaded by the |loader_|.
   void OnLoaderReloaded(scoped_ptr<PolicyBundle> bundle);
 
   // Callback passed to the loader that it uses to pass back the current policy
   // bundle to the provider. This is invoked on the background thread and
-  // forwards to OnLoaderReloaded() on the loop that owns the provider,
+  // forwards to OnLoaderReloaded() on the runner that owns the provider,
   // if |weak_this| is still valid.
-  static void LoaderUpdateCallback(scoped_refptr<base::MessageLoopProxy> loop,
-                                   base::WeakPtr<AsyncPolicyProvider> weak_this,
-                                   scoped_ptr<PolicyBundle> bundle);
+  static void LoaderUpdateCallback(
+                  scoped_refptr<base::SingleThreadTaskRunner> runner,
+                  base::WeakPtr<AsyncPolicyProvider> weak_this,
+                  scoped_ptr<PolicyBundle> bundle);
 
   // The |loader_| that does the platform-specific policy loading. It lives
   // on the background thread but is owned by |this|.
   scoped_ptr<AsyncPolicyLoader> loader_;
 
   // Callback used to synchronize RefreshPolicies() calls with the background
   // thread. See the implementation for the details.
   base::CancelableClosure refresh_callback_;
 
   // Used to get a WeakPtr to |this| for the update callback given to the
   // loader.
   base::WeakPtrFactory<AsyncPolicyProvider> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncPolicyProvider);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_ASYNC_POLICY_PROVIDER_H_