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

content/renderer/render_frame_impl.cc

 // Copyright 2013 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/render_frame_impl.h"
 
 #include <map>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 3705 matching lines @@
   Send(new FrameHostMsg_DidRunContentWithCertificateErrors(
       routing_id_, GURL(main_resource_url).GetOrigin(), url, security_info));
 }
 
 void RenderFrameImpl::didChangePerformanceTiming() {
   FOR_EACH_OBSERVER(RenderFrameObserver,
                     observers_,
                     DidChangePerformanceTiming());
 }
 
-void RenderFrameImpl::didAbortLoading(blink::WebLocalFrame* frame) {
-  DCHECK(!frame_ || frame_ == frame);
-#if defined(ENABLE_PLUGINS)
-  if (frame != render_view_->webview()->mainFrame())
-    return;
-  PluginChannelHost::Broadcast(
-      new PluginHostMsg_DidAbortLoading(render_view_->GetRoutingID()));
-#endif
-}
-
 void RenderFrameImpl::didCreateScriptContext(blink::WebLocalFrame* frame,
                                              v8::Local<v8::Context> context,
                                              int extension_group,
                                              int world_id) {
   DCHECK(!frame_ || frame_ == frame);
 
   FOR_EACH_OBSERVER(RenderFrameObserver, observers_,
                     DidCreateScriptContext(context, extension_group, world_id));
 }
 
@@ skipping 1746 matching lines @@
       media::ConvertToSwitchOutputDeviceCB(web_callbacks);
   scoped_refptr<media::AudioOutputDevice> device =
       AudioDeviceFactory::NewOutputDevice(routing_id_, 0, sink_id.utf8(),
                                           security_origin);
   media::OutputDeviceStatus status = device->GetDeviceStatus();
   device->Stop();
   callback.Run(status);
 }
 
 }  // namespace content