Update from https://crrev.com/307664

cc/scheduler/begin_frame_source.h

 // Copyright 2014 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 CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 #define CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 167 matching lines @@
   void DidFinishFrame(size_t remaining_frames) override;
 
   // Tracing
   void AsValueInto(base::debug::TracedValue* dict) const override;
 
  protected:
   explicit BackToBackBeginFrameSource(
       base::SingleThreadTaskRunner* task_runner);
   virtual base::TimeTicks Now();  // Now overridable for testing
 
-  base::WeakPtrFactory<BackToBackBeginFrameSource> weak_factory_;
   base::SingleThreadTaskRunner* task_runner_;
 
   bool send_begin_frame_posted_;
 
   // BeginFrameSourceMixIn
   void OnNeedsBeginFramesChange(bool needs_begin_frames) override;
 
   void BeginFrame();
+
+ private:
+  base::WeakPtrFactory<BackToBackBeginFrameSource> weak_factory_;
 };
 
 // A frame source which is locked to an external parameters provides from a
 // vsync source and generates BeginFrameArgs for it.
 class CC_EXPORT SyntheticBeginFrameSource : public BeginFrameSourceMixIn,
                                             public VSyncParameterObserver,
                                             public TimeSourceClient {
  public:
   static scoped_ptr<SyntheticBeginFrameSource> Create(
       base::SingleThreadTaskRunner* task_runner,
@@ skipping 67 matching lines @@
 
   base::TimeDelta minimum_interval_;
 
   BeginFrameSource* active_source_;
   std::set<BeginFrameSource*> source_list_;
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_BEGIN_FRAME_SOURCE_H_