Get rid of chrome dependencies from tab_contents_drag_win.cc. After this I'll move it to content\br…

content/browser/tab_contents/web_drag_dest_delegate.h

Index: content/browser/tab_contents/web_drag_dest_delegate.h
===================================================================
--- content/browser/tab_contents/web_drag_dest_delegate.h	(revision 124607)
+++ content/browser/tab_contents/web_drag_dest_delegate.h	(working copy)
@@ -17,7 +17,12 @@
 #endif
 
 class GURL;
+struct WebDropData;
 
+namespace ui {
+class OSExchangeData;
+}
+
 namespace content {
 
 class WebContents;
@@ -53,6 +58,11 @@
   virtual void OnReceiveDataFromGtk(GtkSelectionData* data) = 0;
   virtual void OnReceiveProcessedData(const GURL& url,
                                       const string16& title) = 0;
+#elif defined(OS_WIN)
+  // Allows the delegate to set data on the drag. If it doesn't want to set
+  // data, it should return false.
+  virtual bool AddDragData(const WebDropData& drop_data,
+                           ui::OSExchangeData* data) = 0;
 #endif  // TOOLKIT_USES_GTK
 
   virtual ~WebDragDestDelegate() {}