Remove foreground tab idle handler

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 0e5776f6ea5a870afdf36fa8ceb11a5761398bb6..ded3b6b02f88be109d94a78747514091d7e4295d 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -101,7 +101,6 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
 
   // IPC::MessageFilter methods:
   virtual void OnChannelClosing() OVERRIDE;
-  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
 
   // BrowserMessageFilter methods:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
@@ -214,8 +213,6 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
   void OnCheckNotificationPermission(const GURL& source_origin,
                                      int* permission_level);
 
-  void OnGetCPUUsage(int* cpu_usage);
-
   void OnGetAudioHardwareConfig(media::AudioParameters* input_params,
                                 media::AudioParameters* output_params);
 
@@ -334,13 +331,6 @@ class CONTENT_EXPORT RenderMessageFilter : public BrowserMessageFilter {
 
   std::set<OpenChannelToNpapiPluginCallback*> plugin_host_clients_;
 
-  // Records the last time we sampled CPU usage of the renderer process.
-  base::TimeTicks cpu_usage_sample_time_;
-  // Records the last sampled CPU usage in percents.
-  int cpu_usage_;
-  // Used for sampling CPU usage of the renderer process.
-  scoped_ptr<base::ProcessMetrics> process_metrics_;

[sullivan, 2014/09/25 14:34:47]

Does this affect the PerformanceMonitor.AverageCPU.RendererProcess UMA metric?
We do use that to monitor CPU usage:

https://uma.googleplex.com/timeline#metric=PerformanceMonitor.AverageCPU.Rend...

[jochen (gone - plz use gerrit), 2014/09/25 15:08:36]

that's collected here:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/per...

-
   media::AudioManager* audio_manager_;
   MediaInternals* media_internals_;