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

content/renderer/pepper/pepper_webplugin_impl.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/renderer/pepper/pepper_webplugin_impl.h"
 
 #include <cmath>
 
 #include "base/debug/crash_logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 236 matching lines @@
     document_loader->didFinishLoading(
         NULL, 0.0, blink::WebURLLoaderClient::kUnknownEncodedDataLength);
 }
 
 void PepperWebPluginImpl::didFailLoading(const blink::WebURLError& error) {
   blink::WebURLLoaderClient* document_loader = instance_->document_loader();
   if (document_loader)
     document_loader->didFail(NULL, error);
 }
 
-void PepperWebPluginImpl::didFinishLoadingFrameRequest(const blink::WebURL& url,
-                                                       void* notify_data) {}
-
-void PepperWebPluginImpl::didFailLoadingFrameRequest(
-    const blink::WebURL& url,
-    void* notify_data,
-    const blink::WebURLError& error) {}
-
 bool PepperWebPluginImpl::hasSelection() const {
   return !selectionAsText().isEmpty();
 }
 
 WebString PepperWebPluginImpl::selectionAsText() const {
   return instance_->GetSelectedText(false);
 }
 
 WebString PepperWebPluginImpl::selectionAsMarkup() const {
   return instance_->GetSelectedText(true);
@@ skipping 40 matching lines @@
 
 bool PepperWebPluginImpl::canRotateView() { return instance_->CanRotateView(); }
 
 void PepperWebPluginImpl::rotateView(RotationType type) {
   instance_->RotateView(type);
 }
 
 bool PepperWebPluginImpl::isPlaceholder() { return false; }
 
 }  // namespace content