Fixed drag and drop into and out of Browser Plugin.

content/browser/browser_plugin/browser_plugin_guest_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/browser_plugin/browser_plugin_guest_helper.h"
 
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/common/drag_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 14 matching lines @@
     const IPC::Message& message) {
   if (ShouldForwardToBrowserPluginGuest(message))
     return guest_->OnMessageReceived(message);
   return false;
 }
 
 // static
 bool BrowserPluginGuestHelper::ShouldForwardToBrowserPluginGuest(
     const IPC::Message& message) {
   switch (message.type()) {
-    case DragHostMsg_UpdateDragCursor::ID:
+    case DragHostMsg_StartDragging::ID:
+    case DragHostMsg_TargetDrop_ACK::ID:
     case ViewHostMsg_HasTouchEventHandlers::ID:
     case ViewHostMsg_SetCursor::ID:
  #if defined(OS_MACOSX)
     case ViewHostMsg_ShowPopup::ID:
  #endif
     case ViewHostMsg_ShowWidget::ID:
     case ViewHostMsg_TakeFocus::ID:
     case ViewHostMsg_UpdateFrameName::ID:
     case ViewHostMsg_UpdateRect::ID:
     case ViewHostMsg_LockMouse::ID:
     case ViewHostMsg_UnlockMouse::ID:
       return true;
     default:
       break;
   }
   return false;
 }
 
 }  // namespace content