Implement WebContentsView::GetDropData for Mac; disable on Aura

content/browser/web_contents/web_drag_dest_mac.h

Index: content/browser/web_contents/web_drag_dest_mac.h
diff --git a/content/browser/web_contents/web_drag_dest_mac.h b/content/browser/web_contents/web_drag_dest_mac.h
index 0e22fa0b4c4f5e3497378781c612d9e81a9bbbc5..8a2955af6c4497e4cacee9ea3f7801ad782bb000 100644
--- a/content/browser/web_contents/web_drag_dest_mac.h
+++ b/content/browser/web_contents/web_drag_dest_mac.h
@@ -5,9 +5,9 @@
 #import <Cocoa/Cocoa.h>
 
 #include "base/string16.h"
+#include "webkit/glue/webdropdata.h"
 
 class WebContentsImpl;
-struct WebDropData;
 
 namespace content {
 class RenderViewHost;
@@ -31,11 +31,14 @@ typedef content::RenderViewHost* RenderViewHostIdentifier;
 
   // Updated asynchronously during a drag to tell us whether or not we should
   // allow the drop.
-  NSDragOperation current_operation_;
+  NSDragOperation currentOperation_;
 
   // Keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.
   RenderViewHostIdentifier currentRVH_;
+
+  // The data for the current drag, or NULL if none is in progress.
+  scoped_ptr<WebDropData> dropData_;
 }
 
 // |contents| is the WebContentsImpl representing this tab, used to communicate
@@ -43,6 +46,8 @@ typedef content::RenderViewHost* RenderViewHostIdentifier;
 // (if necessary).
 - (id)initWithWebContentsImpl:(WebContentsImpl*)contents;
 
+- (WebDropData*)currentDropData;
+
 - (void)setDragDelegate:(content::WebDragDestDelegate*)delegate;
 
 // Sets the current operation negotiated by the source and destination,