Remove PluginLoadObserver and related logic, it was only used for NPAPI.

content/plugin/webplugin_delegate_stub.h

 // 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.
 
 #ifndef CONTENT_PLUGIN_WEBPLUGIN_DELEGATE_STUB_H_
 #define CONTENT_PLUGIN_WEBPLUGIN_DELEGATE_STUB_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 49 matching lines @@
   // renderer over the IPC channel.
   void OnInit(const PluginMsg_Init_Params& params,
               bool* transparent,
               bool* result);
   void OnWillSendRequest(int id, const GURL& url, int http_status_code);
   void OnDidReceiveResponse(const PluginMsg_DidReceiveResponseParams& params);
   void OnDidReceiveData(int id, const std::vector<char>& buffer,
                         int data_offset);
   void OnDidFinishLoading(int id);
   void OnDidFail(int id);
-  void OnDidFinishLoadWithReason(const GURL& url, int reason, int notify_id);
   void OnSetFocus(bool focused);
   void OnHandleInputEvent(const blink::WebInputEvent* event,
                           bool* handled, WebCursor* cursor);
   void OnPaint(const gfx::Rect& damaged_rect);
   void OnDidPaint();
   void OnUpdateGeometry(const PluginMsg_UpdateGeometry_Param& param);
   void OnGetPluginScriptableObject(int* route_id);
   void OnSendJavaScriptStream(const GURL& url,
                               const std::string& result,
-                              bool success,
-                              int notify_id);
+                              bool success);
   void OnGetFormValue(base::string16* value, bool* success);
 
   void OnSetContentAreaFocus(bool has_focus);
 #if defined(OS_WIN) && !defined(USE_AURA)
   void OnImeCompositionUpdated(const base::string16& text,
                                const std::vector<int>& clauses,
                                const std::vector<int>& target,
                                int cursor_position);
   void OnImeCompositionCompleted(const base::string16& text);
 #endif
 #if defined(OS_MACOSX)
   void OnSetWindowFocus(bool has_focus);
   void OnContainerHidden();
   void OnContainerShown(gfx::Rect window_frame, gfx::Rect view_frame,
                         bool has_focus);
   void OnWindowFrameChanged(const gfx::Rect& window_frame,
                             const gfx::Rect& view_frame);
   void OnImeCompositionCompleted(const base::string16& text);
 #endif
 
   void OnDidReceiveManualResponse(
       const GURL& url,
       const PluginMsg_DidReceiveResponseParams& params);
   void OnDidReceiveManualData(const std::vector<char>& buffer);
   void OnDidFinishManualLoading();
   void OnDidManualLoadFail();
   void OnHandleURLRequestReply(unsigned long resource_id,
-                               const GURL& url,
-                               int notify_id);
+                               const GURL& url);
   void OnHTTPRangeRequestReply(unsigned long resource_id, int range_request_id);
   void OnFetchURL(const PluginMsg_FetchURL_Params& params);
 
   std::string mime_type_;
   int instance_id_;
 
   scoped_refptr<PluginChannel> channel_;
 
   base::WeakPtr<NPObjectStub> plugin_scriptable_object_;
   WebPluginDelegateImpl* delegate_;
   WebPluginProxy* webplugin_;
   bool in_destructor_;
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebPluginDelegateStub);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PLUGIN_WEBPLUGIN_DELEGATE_STUB_H_