Remove unused includes of plugin_list.h. Also remove unused ContentClient and webkit_support method…

webkit/support/webkit_support.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 WEBKIT_SUPPORT_WEBKIT_SUPPORT_H_
 #define WEBKIT_SUPPORT_WEBKIT_SUPPORT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
 // TestSuite, in which case no AtExitManager is created and ICU is not
 // initialized (as it is already done by the TestSuite).
 void SetUpTestEnvironmentForUnitTests();
 void TearDownTestEnvironment();
 
 // Returns a pointer to a Platform implementation for
 // DumpRenderTree.  Needs to call SetUpTestEnvironment() before this.
 // This returns a pointer to a static instance.  Don't delete it.
 WebKit::Platform* GetWebKitPlatformSupport();
 
-// This is used by WebFrameClient::createPlugin().
-WebKit::WebPlugin* CreateWebPlugin(WebKit::WebFrame* frame,
-                                   const WebKit::WebPluginParams& params);
-
 // Returns the root directory of the WebKit code.
 WebKit::WebString GetWebKitRootDir();
 
 enum GLBindingPreferences {
   GL_BINDING_DEFAULT,
   GL_BINDING_SOFTWARE_RENDERER
 };
 void SetUpGLBindings(GLBindingPreferences);
 
 enum GraphicsContext3DImplementation {
@@ skipping 155 matching lines @@
 
 void EnableWebCoreLogChannels(const std::string& channels);
 
 // - Gamepad
 
 void SetGamepadData(const WebKit::WebGamepads& pads);
 
 }  // namespace webkit_support
 
 #endif  // WEBKIT_SUPPORT_WEBKIT_SUPPORT_H_