Power Save Blocker: Eliminate passing ViewAndroid as WeakPtr

device/power_save_blocker/power_save_blocker.h

 // 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.
 
 #ifndef DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_
 #define DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
 #include "device/power_save_blocker/power_save_blocker_export.h"
 
 #if defined(OS_ANDROID)
 #include "ui/android/view_android.h"
 #endif  // OS_ANDROID
 
 namespace device {
 
@@ skipping 35 matching lines @@
       PowerSaveBlockerType type,
       Reason reason,
       const std::string& description,
       scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> blocking_task_runner);
   virtual ~PowerSaveBlocker();
 
 #if defined(OS_ANDROID)
   // On Android, the kPowerSaveBlockPreventDisplaySleep type of
   // PowerSaveBlocker should associated with a View, so the blocker can be
-  // removed by the platform.
+  // removed by the platform. Note that |view_android| is guaranteed to be
+  // valid only for the lifetime of this call; hence it should not be cached
+  // internally.
   DEVICE_POWER_SAVE_BLOCKER_EXPORT void InitDisplaySleepBlocker(
-      const base::WeakPtr<ui::ViewAndroid>& view_android);
+      ui::ViewAndroid* view_android);
 #endif
 
  private:
   class Delegate;
 
   // Implementations of this class may need a second object with different
   // lifetime than the RAII container, or additional storage. This member is
   // here for that purpose. If not used, just define the class as an empty
   // RefCounted (or RefCountedThreadSafe) like so to make it compile:
   // class PowerSaveBlocker::Delegate
@@ skipping 13 matching lines @@
 
   scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerSaveBlocker);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_POWER_SAVE_BLOCKER_POWER_SAVE_BLOCKER_H_