Remove dependency of power_save_blocker_android on various content bits

content/browser/devtools/render_frame_devtools_agent_host.cc

Index: content/browser/devtools/render_frame_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.cc b/content/browser/devtools/render_frame_devtools_agent_host.cc
index d4f91ab51e708a644c53a2b38f9929dc2efdf791..93a1ca0e08c0baf1ca0adb790da781e12a0ca3d5 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.cc
+++ b/content/browser/devtools/render_frame_devtools_agent_host.cc
@@ -502,7 +502,7 @@ void RenderFrameDevToolsAgentHost::OnClientAttached() {
           PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
           PowerSaveBlocker::kReasonOther, "DevTools")
           .release()));
-  power_save_blocker_->InitDisplaySleepBlocker(web_contents());
+  power_save_blocker_->InitDisplaySleepBlocker(web_contents()->GetNativeView());
 #endif
 
   // TODO(kaznacheev): Move this call back to DevToolsManager when
@@ -749,6 +749,13 @@ void RenderFrameDevToolsAgentHost::DidFailProvisionalLoad(
     DiscardPending();
 }
 
+void RenderFrameDevToolsAgentHost::WebContentsDestroyed() {
+#if defined(OS_ANDROID)
+  if (power_save_blocker_)
+    power_save_blocker_->ClearViewForSleepBlocker();
+#endif
+}
+
 void RenderFrameDevToolsAgentHost::
     DispatchBufferedProtocolMessagesIfNecessary() {
   if (navigating_handles_.empty() &&