content: Split web_drag_dest_gtk.cc into chrome/ and content/ parts.

chrome/browser/tab_contents/tab_contents_view_gtk.h

Index: chrome/browser/tab_contents/tab_contents_view_gtk.h
diff --git a/chrome/browser/tab_contents/tab_contents_view_gtk.h b/chrome/browser/tab_contents/tab_contents_view_gtk.h
index 3d8d36104a8e3d77a2a517f01a687b163a15f59c..56bb9118399fa783b2f8a404d854369578d4d7a3 100644
--- a/chrome/browser/tab_contents/tab_contents_view_gtk.h
+++ b/chrome/browser/tab_contents/tab_contents_view_gtk.h
@@ -23,6 +23,7 @@ class ConstrainedWindowGtk;
 class RenderViewContextMenuGtk;
 class SadTabGtk;
 class TabContentsDragSource;
+class WebDragBookmarkHandlerGtk;
 class WebDragDestGtk;
 
 class TabContentsViewGtk : public TabContentsView,
@@ -159,6 +160,9 @@ class TabContentsViewGtk : public TabContentsView,
   // GTK.
   scoped_ptr<WebDragDestGtk> drag_dest_;
 
+  // The chrome specific delegate that receives events from WebDragDestGtk.
+  scoped_ptr<WebDragBookmarkHandlerGtk> bookmark_handler_gtk_;
+
   // Object responsible for handling drags from the page for us.
   scoped_ptr<TabContentsDragSource> drag_source_;