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

content/common/mac/scoped_sending_event.mm

Index: content/common/mac/scoped_sending_event.mm
diff --git a/content/common/mac/scoped_sending_event.mm b/content/common/mac/scoped_sending_event.mm
deleted file mode 100644
index bc4deac2a96cf19dcb0cd459d3633bb4780cc1e0..0000000000000000000000000000000000000000
--- a/content/common/mac/scoped_sending_event.mm
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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.
-
-#import "content/common/mac/scoped_sending_event.h"
-
-#include "base/logging.h"
-
-namespace content {
-namespace mac {
-
-ScopedSendingEvent::ScopedSendingEvent()
-    : app_(static_cast<NSObject<CrAppControlProtocol>*>(NSApp)) {
-  DCHECK([app_ conformsToProtocol:@protocol(CrAppControlProtocol)]);
-  handling_ = [app_ isHandlingSendEvent];
-  [app_ setHandlingSendEvent:YES];
-}
-
-ScopedSendingEvent::~ScopedSendingEvent() {
-  [app_ setHandlingSendEvent:handling_];
-}
-
-}  // namespace mac
-}  // namespace content