Revert r286729

content/child/child_thread.h

Index: content/child/child_thread.h
diff --git a/content/child/child_thread.h b/content/child/child_thread.h
index 88b52abecde5395c969997ce871c2705315c5ac7..9b63fb8eeef21f67fb81c6aa29aa643866e93146 100644
--- a/content/child/child_thread.h
+++ b/content/child/child_thread.h
@@ -40,7 +40,6 @@ class ChildHistogramMessageFilter;
 class ChildResourceMessageFilter;
 class ChildSharedBitmapManager;
 class FileSystemDispatcher;
-class ProcessBackgroundMessageFilter;
 class ServiceWorkerMessageFilter;
 class QuotaDispatcher;
 class QuotaMessageFilter;
@@ -191,6 +190,7 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
   void OnSetProfilerStatus(tracked_objects::ThreadData::Status status);
   void OnGetChildProfilerData(int sequence_number);
   void OnDumpHandles();
+  void OnProcessBackgrounded(bool background);
 #ifdef IPC_MESSAGE_LOG_ENABLED
   void OnSetIPCLoggingEnabled(bool enable);
 #endif
@@ -239,9 +239,6 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
 
   scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 
-  scoped_refptr<ProcessBackgroundMessageFilter>
-      process_background_message_filter_;
-
   scoped_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
 
   base::WeakPtrFactory<ChildThread> channel_connected_factory_;