Move WebDropData to content::DropData and split off conversion function.

content/port/browser/render_view_host_delegate_view.h

Index: content/port/browser/render_view_host_delegate_view.h
diff --git a/content/port/browser/render_view_host_delegate_view.h b/content/port/browser/render_view_host_delegate_view.h
index 8b7b95320f8b5d812cd7a0e60b86069e3f30f018..375b867214da4e42bbda2d98a084ea3df638398d 100644
--- a/content/port/browser/render_view_host_delegate_view.h
+++ b/content/port/browser/render_view_host_delegate_view.h
@@ -13,7 +13,6 @@
 #include "third_party/WebKit/public/web/WebDragOperation.h"
 
 class SkBitmap;
-struct WebDropData;
 struct WebMenuItem;
 
 namespace gfx {
@@ -25,6 +24,7 @@ class Vector2d;
 namespace content {
 
 struct ContextMenuParams;
+struct DropData;
 
 // This class provides a way for the RenderViewHost to reach out to its
 // delegate's view. It only needs to be implemented by embedders if they don't
@@ -48,10 +48,10 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
 
   // The user started dragging content of the specified type within the
   // RenderView. Contextual information about the dragged content is supplied
-  // by WebDropData. If the delegate's view cannot start the drag for /any/
+  // by DropData. If the delegate's view cannot start the drag for /any/
   // reason, it must inform the renderer that the drag has ended; otherwise,
   // this results in bugs like http://crbug.com/157134.
-  virtual void StartDragging(const WebDropData& drop_data,
+  virtual void StartDragging(const DropData& drop_data,
                              WebKit::WebDragOperationsMask allowed_ops,
                              const gfx::ImageSkia& image,
                              const gfx::Vector2d& image_offset,