Remove CrApplication dependency from base

base/message_pump_mac.h

 // Copyright (c) 2008 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.
 
 // The basis for all native run loops on the Mac is the CFRunLoop.  It can be
 // used directly, it can be used as the driving force behind the similar
 // Foundation NSRunLoop, and it can be used to implement higher-level event
 // loops such as the NSApplication event loop.
 //
 // This file introduces a basic CFRunLoop-based implementation of the
@@ skipping 18 matching lines @@
 
 #ifndef BASE_MESSAGE_PUMP_MAC_H_
 #define BASE_MESSAGE_PUMP_MAC_H_
 #pragma once
 
 #include "base/message_pump.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/IOKitLib.h>
 
-#if defined(__OBJC__)
-@class NSAutoreleasePool;
-#else  // defined(__OBJC__)
+#if !defined(__OBJC__)
 class NSAutoreleasePool;
-#endif  // defined(__OBJC__)
+#else  // !defined(__OBJC__)
+#import <AppKit/AppKit.h>
+
+// Clients must subclass NSApplication and implement this protocol if they use
+// MessagePumpMac.
+@protocol CrAppProtocol
+// Must return true if -[NSApplication sendEvent:] is currently on the stack.
+// See the comment for |CreateAutoreleasePool()| in the cc file for why this is
+// necessary.
+- (BOOL)isHandlingSendEvent;
+@end
+#endif  // !defined(__OBJC__)
 
 namespace base {
 
 class TimeTicks;
 
 class MessagePumpCFRunLoopBase : public MessagePump {
   // Needs access to CreateAutoreleasePool.
   friend class MessagePumpScopedAutoreleasePool;
  public:
   MessagePumpCFRunLoopBase();
@@ skipping 213 matching lines @@
   // thread.  Otherwise, returns a new instance of MessagePumpNSRunLoop.
   static MessagePump* Create();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePumpMac);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_MAC_H_