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

components/test_runner/test_plugin.h

 // 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.
 
 #ifndef COMPONENTS_TEST_RUNNER_TEST_PLUGIN_H_
 #define COMPONENTS_TEST_RUNNER_TEST_PLUGIN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 67 matching lines @@
       blink::WebCursorInfo& info) override;
   bool handleDragStatusUpdate(blink::WebDragStatus drag_status,
                               const blink::WebDragData& data,
                               blink::WebDragOperationsMask mask,
                               const blink::WebPoint& position,
                               const blink::WebPoint& screen_position) override;
   void didReceiveResponse(const blink::WebURLResponse& response) override {}
   void didReceiveData(const char* data, int data_length) override {}
   void didFinishLoading() override {}
   void didFailLoading(const blink::WebURLError& error) override {}
-  void didFinishLoadingFrameRequest(const blink::WebURL& url,
-                                    void* notify_data) override {}
-  void didFailLoadingFrameRequest(const blink::WebURL& url,
-                                  void* notify_data,
-                                  const blink::WebURLError& error) override {}
   bool isPlaceholder() override;
 
   // cc::TextureLayerClient methods:
   bool PrepareTextureMailbox(
       cc::TextureMailbox* mailbox,
       scoped_ptr<cc::SingleReleaseCallback>* release_callback,
       bool use_shared_memory) override;
 
  private:
   TestPlugin(blink::WebFrame* frame,
@@ skipping 72 matching lines @@
 
   bool is_persistent_;
   bool can_create_without_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(TestPlugin);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_TEST_PLUGIN_H_