mac 10.7 SDK: Add missing protocols.

It's just one.

BUG=136844
TEST=none


Review URL: https://chromiumcodereview.appspot.com/10833031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148616 0039d316-1c4b-4281-b951-d872f2087c98

base/mac/cocoa_protocols.h

@@ -11,8 +11,8 @@
 // requires. Augment that below.
 #import "third_party/GTM/GTMDefines.h"
 
-// The Mac OS X 10.8 SDK introduced new protocols used for delegates.  These
-// protocol defintions were not present in earlier releases of the Mac OS X
+// New Mac OS X SDKs introduce new protocols used for delegates.  These
+// protocol defintions aren't not present in earlier releases of the Mac OS X
 // SDK.  In order to support building against the new SDK, which requires
 // delegates to conform to these protocols, and earlier SDKs, which do not
 // define these protocols at all, this file will provide empty protocol
@@ -22,6 +22,13 @@
 @protocol p \
 @end
 
+#if !defined(MAC_OS_X_VERSION_10_7) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
+
+DEFINE_EMPTY_PROTOCOL(NSDraggingDestination)
+
+#endif  // MAC_OS_X_VERSION_10_7
+
 #if !defined(MAC_OS_X_VERSION_10_8) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_8
 

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -8,6 +8,7 @@
 #import <Cocoa/Cocoa.h>
 #include <map>
 
+#import "base/mac/cocoa_protocols.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/chrome_browser_application_mac.h"
@@ -149,7 +150,8 @@ willAnimateFromState:(bookmarks::VisualState)oldState
                      BookmarkButtonDelegate,
                      BookmarkButtonControllerProtocol,
                      CrApplicationEventHookProtocol,
-                     NSUserInterfaceValidations> {
+                     NSUserInterfaceValidations,
+                     NSDraggingDestination> {
  @private
   // The visual state of the bookmark bar. If an animation is running, this is
   // set to the "destination" and |lastVisualState_| is set to the "original"