Revert of Deletes mojo::Callback

chrome/renderer/chrome_render_thread_observer.cc

 // Copyright (c) 2012 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 "chrome/renderer/chrome_render_thread_observer.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <memory>
@@ skipping 152 matching lines @@
   }
 
   void SendResults() {
     if (!callback_.is_null())
       callback_.Run(std::move(usage_data_));
     callback_.Reset();
     weak_factory_.InvalidateWeakPtrs();
     workers_to_go_ = 0;
   }
 
-  void GetUsageData(const GetUsageDataCallback& callback) override {
+  void GetUsageData(const mojo::Callback<void(mojom::ResourceUsageDataPtr)>&
+                        callback) override {
     DCHECK(callback_.is_null());
     weak_factory_.InvalidateWeakPtrs();
     usage_data_ = mojom::ResourceUsageData::New();
     usage_data_->reports_v8_stats = true;
     callback_ = callback;
 
     // Since it is not safe to call any Blink or V8 functions until Blink has
     // been initialized (which also initializes V8), early out and send 0 back
     // for all resources.
     if (!observer_) {
@@ skipping 23 matching lines @@
           FROM_HERE, base::Bind(&ResourceUsageReporterImpl::SendResults,
                                 weak_factory_.GetWeakPtr()),
           base::TimeDelta::FromMilliseconds(kWaitForWorkersStatsTimeoutMS));
     } else {
       // No worker threads so just send out the main thread data right away.
       SendResults();
     }
   }
 
   mojom::ResourceUsageDataPtr usage_data_;
-  GetUsageDataCallback callback_;
+  mojo::Callback<void(mojom::ResourceUsageDataPtr)> callback_;
   int workers_to_go_;
   mojo::StrongBinding<mojom::ResourceUsageReporter> binding_;
   base::WeakPtr<ChromeRenderThreadObserver> observer_;
 
   base::WeakPtrFactory<ResourceUsageReporterImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceUsageReporterImpl);
 };
 
 void CreateResourceUsageReporter(
@@ skipping 75 matching lines @@
 void ChromeRenderThreadObserver::OnSetFieldTrialGroup(
     const std::string& trial_name,
     const std::string& group_name) {
   field_trial_syncer_.OnSetFieldTrialGroup(trial_name, group_name);
 }
 
 const RendererContentSettingRules*
 ChromeRenderThreadObserver::content_setting_rules() const {
   return &content_setting_rules_;
 }