Remove dependency of power_save_blocker_android on various content bits

content/browser/media/media_web_contents_observer.cc

 // 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.
 
 #include "content/browser/media/media_web_contents_observer.h"
 
 #include <memory>
 
 #include "base/lazy_instance.h"
 #include "build/build_config.h"
@@ skipping 17 matching lines @@
 }  // anonymous namespace
 
 MediaWebContentsObserver::MediaWebContentsObserver(WebContents* web_contents)
     : WebContentsObserver(web_contents),
       session_controllers_manager_(this) {}
 
 MediaWebContentsObserver::~MediaWebContentsObserver() {}
 
 void MediaWebContentsObserver::WebContentsDestroyed() {
   g_audible_metrics.Get().UpdateAudibleWebContentsState(web_contents(), false);
+#if defined(OS_ANDROID)
+  view_weak_factory_.reset();
+#endif
 }
 
 void MediaWebContentsObserver::RenderFrameDeleted(
     RenderFrameHost* render_frame_host) {
   ClearPowerSaveBlockers(render_frame_host);
   session_controllers_manager_.RenderFrameDeleted(render_frame_host);
 }
 
 void MediaWebContentsObserver::MaybeUpdateAudibleState() {
   if (!AudioStreamMonitor::monitoring_available())
@@ skipping 138 matching lines @@
       PowerSaveBlocker::kReasonAudioPlayback, "Playing audio");
 }
 
 void MediaWebContentsObserver::CreateVideoPowerSaveBlocker() {
   DCHECK(!video_power_save_blocker_);
   DCHECK(!active_video_players_.empty());
   video_power_save_blocker_ = CreatePowerSaveBlocker(
       PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
       PowerSaveBlocker::kReasonVideoPlayback, "Playing video");
 #if defined(OS_ANDROID)
-  static_cast<PowerSaveBlockerImpl*>(video_power_save_blocker_.get())
-      ->InitDisplaySleepBlocker(web_contents());
+  if (web_contents()->GetNativeView()) {
+    view_weak_factory_.reset(new base::WeakPtrFactory<ui::ViewAndroid>(
+        web_contents()->GetNativeView()));
+    static_cast<PowerSaveBlockerImpl*>(video_power_save_blocker_.get())
+        ->InitDisplaySleepBlocker(view_weak_factory_->GetWeakPtr());
+  }
 #endif
 }
 
 void MediaWebContentsObserver::MaybeReleasePowerSaveBlockers() {
   // If there are no more audio players and we don't have audio stream
   // monitoring, release the audio power save blocker here instead of during
   // NotifyNavigationStateChanged().
   if (active_audio_players_.empty() &&
       !AudioStreamMonitor::monitoring_available()) {
     audio_power_save_blocker_.reset();
@@ skipping 37 matching lines @@
   if (it == player_map->end())
     return;
 
   for (int delegate_id : it->second)
     removed_players->insert(MediaPlayerId(render_frame_host, delegate_id));
 
   player_map->erase(it);
 }
 
 }  // namespace content