[Mac] Move ScopedSendingEvent from content/common/mac to base/mac.

base/mac/scoped_sending_event.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_MAC_SCOPED_SENDING_EVENT_H_
-#define CONTENT_COMMON_MAC_SCOPED_SENDING_EVENT_H_
+#ifndef BASE_MAC_SCOPED_SENDING_EVENT_H_
+#define BASE_MAC_SCOPED_SENDING_EVENT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/message_pump_mac.h"
 
 // Nested event loops can pump IPC messages, including
 // script-initiated tab closes, which could release objects that the
 // nested event loop might message.  CrAppProtocol defines how to ask
 // the embedding NSApplication subclass if an event is currently being
 // handled, in which case such closes are deferred to the top-level
 // event loop.
 //
 // ScopedSendingEvent allows script-initiated event loops to work like
 // a nested event loop, as such events do not arrive via -sendEvent:.
 // CrAppControlProtocol lets ScopedSendingEvent tell the embedding
 // NSApplication what to return from -handlingSendEvent.
 
 @protocol CrAppControlProtocol<CrAppProtocol>
 - (void)setHandlingSendEvent:(BOOL)handlingSendEvent;
 @end
 
-namespace content {
+namespace base {
 namespace mac {
 
 class ScopedSendingEvent {
  public:
   ScopedSendingEvent();
   ~ScopedSendingEvent();
 
  private:
   // The NSApp in control at the time the constructor was run, to be
   // sure the |handling_| setting is restored appropriately.
   NSObject<CrAppControlProtocol>* app_;
   BOOL handling_;  // Value of -[app_ handlingSendEvent] at construction.
 
   DISALLOW_COPY_AND_ASSIGN(ScopedSendingEvent);
 };
 
 }  // namespace mac
-}  // namespace content
+}  // namespace base
 
-#endif  // CONTENT_COMMON_MAC_SCOPED_SENDING_EVENT_H_
+#endif  // BASE_MAC_SCOPED_SENDING_EVENT_H_