Cleanup everything but net/ for our first clang plugins.

chrome/browser/tab_contents/tab_contents_observer.h

 // Copyright (c) 2011 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 CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_OBSERVER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_OBSERVER_H_
 
 #include "chrome/browser/tab_contents/navigation_controller.h"
 #include "ipc/ipc_channel.h"
 
 struct ViewHostMsg_FrameNavigate_Params;
 
 // An observer API implemented by classes which are interested in various page
 // load events from TabContents.  They also get a chance to filter IPC messages.
 class TabContentsObserver : public IPC::Channel::Listener {
  public:
   virtual void NavigateToPendingEntry() { }
 
   virtual void DidNavigateMainFramePostCommit(
       const NavigationController::LoadCommittedDetails& details,
       const ViewHostMsg_FrameNavigate_Params& params) { }
   virtual void DidNavigateAnyFramePostCommit(
       const NavigationController::LoadCommittedDetails& details,
       const ViewHostMsg_FrameNavigate_Params& params) { }
 
   virtual void DidStartLoading() { }
   virtual void DidStopLoading() { }
 
   // IPC::Channel::Listener implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) { return false; }
+  virtual bool OnMessageReceived(const IPC::Message& message);
 
 #if 0
   // For unifying with delegate...
 
   // Notifies the delegate that this contents is starting or is done loading
   // some resource. The delegate should use this notification to represent
   // loading feedback. See TabContents::is_loading()
   virtual void LoadingStateChanged(TabContents* contents) { }
   // Called to inform the delegate that the tab content's navigation state
   // changed. The |changed_flags| indicates the parts of the navigation state
   // that have been updated, and is any combination of the
   // |TabContents::InvalidateTypes| bits.
   virtual void NavigationStateChanged(const TabContents* source,
                                       unsigned changed_flags) { }
 #endif
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_OBSERVER_H_