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

content/plugin/webplugin_proxy.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_PROXY_H_
 #define CONTENT_PLUGIN_WEBPLUGIN_PROXY_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 48 matching lines @@
   void Invalidate() override;
   void InvalidateRect(const gfx::Rect& rect) override;
   NPObject* GetWindowScriptNPObject() override;
   NPObject* GetPluginElement() override;
   bool FindProxyForUrl(const GURL& url, std::string* proxy_list) override;
   void SetCookie(const GURL& url,
                  const GURL& first_party_for_cookies,
                  const std::string& cookie) override;
   std::string GetCookies(const GURL& url,
                          const GURL& first_party_for_cookies) override;
-  void HandleURLRequest(const char* url,
-                        const char* method,
-                        const char* target,
-                        const char* buf,
-                        unsigned int len,
-                        int notify_id,
-                        bool popups_allowed,
-                        bool notify_redirects) override;
   void UpdateGeometry(const gfx::Rect& window_rect,
                       const gfx::Rect& clip_rect,
                       const TransportDIB::Handle& windowless_buffer0,
                       const TransportDIB::Handle& windowless_buffer1,
                       int windowless_buffer_index);
   void CancelDocumentLoad() override;
-  void InitiateHTTPRangeRequest(const char* url,
-                                const char* range_info,
-                                int range_request_id) override;
   void DidStartLoading() override;
   void DidStopLoading() override;
   void SetDeferResourceLoading(unsigned long resource_id, bool defer) override;
   bool IsOffTheRecord() override;
   void ResourceClientDeleted(WebPluginResourceClient* resource_client) override;
   void URLRedirectResponse(bool allow, int resource_id) override;
   bool CheckIfRunInsecureContent(const GURL& url) override;
 #if defined(OS_WIN)
   void SetWindowlessData(HANDLE pump_messages_event,
                          gfx::NativeViewId dummy_activation_window) override;
@@ skipping 115 matching lines @@
 
   // Contains the routing id of the host render view.
   int host_render_view_routing_id_;
 
   base::WeakPtrFactory<WebPluginProxy> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PLUGIN_WEBPLUGIN_PROXY_H_