Use a direct include of strings headers in content/browser/, part 2.

content/browser/web_contents/web_drag_dest_mac.h

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "webkit/common/webdropdata.h"
 
 
 namespace content {
 class RenderViewHost;
 class WebContentsImpl;
 class WebDragDestDelegate;
 }
 
@@ skipping 58 matching lines @@
              fromPasteboard:(NSPasteboard*)pboard;
 // Given a point in window coordinates and a view in that window, return a
 // flipped point in the coordinate system of |view|.
 - (NSPoint)flipWindowPointToView:(const NSPoint&)windowPoint
                             view:(NSView*)view;
 // Given a point in window coordinates and a view in that window, return a
 // flipped point in screen coordinates.
 - (NSPoint)flipWindowPointToScreen:(const NSPoint&)windowPoint
                               view:(NSView*)view;
 @end