bookmarks: Break the dependency in ui/cocoa.

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

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop.h
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop.h b/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed2ac086617072afbcac7c766c78f0b7a82f86ce
--- /dev/null
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop.h
@@ -0,0 +1,23 @@
+// Copyright 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.
+
+#ifndef CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_
+#define CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_
+
+#include "base/string16.h"
+
+#if defined(__OBJC__)
+@class NSImage;
+#else  // __OBJC__
+class NSImage;
+#endif  // __OBJC__
+
+namespace chrome {
+
+// Returns a drag image for a bookmark.
+NSImage* DragImageForBookmark(NSImage* favicon, const string16& title);
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_