Explicitly declare a method in WebContentsViewCocoa.

content/browser/web_contents/web_contents_view_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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
@@ skipping 32 matching lines @@
   // is possible for an instance to outlive its webContentsView_. The
   // webContentsView_ must call -clearWebContentsView in its destructor.
   content::WebContentsViewMac* webContentsView_;
   base::scoped_nsobject<WebDragSource> dragSource_;
   base::scoped_nsobject<WebDragDest> dragDest_;
   BOOL mouseDownCanMoveWindow_;
 }
 
 - (void)setMouseDownCanMoveWindow:(BOOL)canMove;
 - (void)setOpaque:(BOOL)opaque;
+
+// Returns the available drag operations. This is a required method for
+// NSDraggingSource. It is supposedly deprecated, but the non-deprecated API
+// -[NSWindow dragImage:...] still relies on it.
+- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal;
 @end
 
 namespace content {
 
 // Mac-specific implementation of the WebContentsView. It owns an NSView that
 // contains all of the contents of the tab and associated child views.
 class WebContentsViewMac : public WebContentsView,
                            public RenderViewHostDelegateView {
  public:
   // The corresponding WebContentsImpl is passed in the constructor, and manages
@@ skipping 82 matching lines @@
   bool allow_other_views_;
 
   scoped_ptr<PopupMenuHelper> popup_menu_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MAC_H_