Remove BrowserPlugin tests (only one test remaining with existing coverage)

content/renderer/browser_plugin/mock_browser_plugin_manager.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_RENDERER_BROWSER_PLUGIN_MOCK_BROWSER_PLUGIN_MANAGER_H_
-#define CONTENT_RENDERER_BROWSER_PLUGIN_MOCK_BROWSER_PLUGIN_MANAGER_H_
-
-#include "content/renderer/browser_plugin/browser_plugin_manager.h"
-
-#include "base/memory/scoped_ptr.h"
-#include "content/public/renderer/browser_plugin_delegate.h"
-#include "ipc/ipc_message_utils.h"
-#include "ipc/ipc_test_sink.h"
-
-namespace content {
-
-class MockBrowserPlugin;
-
-class MockBrowserPluginManager : public BrowserPluginManager {
- public:
-  MockBrowserPluginManager(RenderViewImpl* render_view);
-
-  // BrowserPluginManager implementation.
-  virtual BrowserPlugin* CreateBrowserPlugin(
-      RenderViewImpl* render_view,
-      blink::WebFrame* frame,
-      scoped_ptr<BrowserPluginDelegate> delegate) OVERRIDE;
-
-  // Provides access to the messages that have been received by this thread.
-  IPC::TestSink& sink() { return sink_; }
-
-  // RenderViewObserver override.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual bool Send(IPC::Message* msg) OVERRIDE;
-
-  // Returns the latest browser plugin that was created by this manager.
-  MockBrowserPlugin* last_plugin() { return last_plugin_; }
-
- protected:
-  virtual ~MockBrowserPluginManager();
-
-  IPC::TestSink sink_;
-
-  // The last known good deserializer for sync messages.
-  scoped_ptr<IPC::MessageReplyDeserializer> reply_deserializer_;
-
-  MockBrowserPlugin* last_plugin_;
-
-  DISALLOW_COPY_AND_ASSIGN(MockBrowserPluginManager);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_BROWSER_PLUGIN_MOCK_BROWSER_PLUGIN_MANAGER_H_