[Mac] Move event hooks from CrApplication to BrowserCrApplication.

content/common/chrome_application_mac.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 CONTENT_COMMON_CHROME_APPLICATION_MAC_H_
 #define CONTENT_COMMON_CHROME_APPLICATION_MAC_H_
 #pragma once
 
 #if defined(__OBJC__)
 
 #import <AppKit/AppKit.h>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_nsobject.h"
 #import "content/common/mac/scoped_sending_event.h"
 
-// Event hooks must implement this protocol.
-@protocol CrApplicationEventHookProtocol
-- (void)hookForEvent:(NSEvent*)theEvent;
-@end
-
 @interface CrApplication : NSApplication<CrAppControlProtocol> {
  @private
   BOOL handlingSendEvent_;
-  // Array of objects implementing the CrApplicationEventHookProtocol
-  scoped_nsobject<NSMutableArray> eventHooks_;
 }
 - (BOOL)isHandlingSendEvent;
 
 // Unconditionally clears |handlingSendEvent_|.  This should not be
 // used except in recovering from some sort of exceptional condition.
 - (void)clearIsHandlingSendEvent;
 
-// Add or remove an event hook to be called for every sendEvent:
-// that the application receives.  These handlers are called before
-// the normal [NSApplication sendEvent:] call is made.
-
-// This is not a good alternative to a nested event loop.  It should
-// be used only when normal event logic and notification breaks down
-// (e.g. when clicking outside a canBecomeKey:NO window to "switch
-// context" out of it).
-- (void)addEventHook:(id<CrApplicationEventHookProtocol>)hook;
-- (void)removeEventHook:(id<CrApplicationEventHookProtocol>)hook;
-
 + (NSApplication*)sharedApplication;
 @end
 
 #endif  // defined(__OBJC__)
 
 namespace chrome_application_mac {
 
 // To be used to instantiate CrApplication from C++ code.
 void RegisterCrApp();
 
 }  // namespace chrome_application_mac
 
 #endif  // CONTENT_COMMON_CHROME_APPLICATION_MAC_H_