Fixed drag and drop into and out of Browser Plugin.

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index 788dac57a4f895c6723a170bce4ac3601496c65a..69aa75d0aa5bd90e8752cce7c7b341af04710395 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -296,7 +296,7 @@ class WebDragSourceAura : public MessageLoopForUI::Observer,
           aura::Window* window = rvh->GetView()->GetNativeView();
           aura::Window::ConvertPointToTarget(window->GetRootWindow(),
               window, &client_loc);
-          rvh->DragSourceMovedTo(client_loc.x(), client_loc.y(),
+          contents_->DragSourceMovedTo(client_loc.x(), client_loc.y(),
               screen_loc.x(), screen_loc.y());
         }
         break;
@@ -917,8 +917,10 @@ void WebContentsViewAura::EndDrag(WebKit::WebDragOperationsMask ops) {
   RenderViewHost* rvh = web_contents_->GetRenderViewHost();
   aura::Window* window = rvh->GetView()->GetNativeView();
   aura::Window::ConvertPointToTarget(root_window, window, &client_loc);
-  rvh->DragSourceEndedAt(client_loc.x(), client_loc.y(), screen_loc.x(),
-      screen_loc.y(), ops);
+  if (!web_contents_)
+    return;
+  web_contents_->DragSourceEndedAt(client_loc.x(), client_loc.y(),
+      screen_loc.x(), screen_loc.y(), ops);
 }
 
 void WebContentsViewAura::PrepareOverscrollWindow() {