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

chrome/renderer/plugins/plugin_placeholder.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 "chrome/renderer/plugins/plugin_placeholder.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/json/string_escape.h"
 #include "base/strings/string_piece.h"
@@ skipping 21 matching lines @@
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/WebKit/public/web/WebMenuItemInfo.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 #include "third_party/WebKit/public/web/WebScriptSource.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "third_party/re2/re2/re2.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/webui/jstemplate_builder.h"
-#include "webkit/plugins/npapi/plugin_list.h"
 
 #if defined(ENABLE_MOBILE_YOUTUBE_PLUGIN)
 #include "webkit/plugins/plugin_constants.h"
 #endif
 
 using content::RenderThread;
 using content::RenderView;
 using WebKit::WebContextMenuData;
 using WebKit::WebDocument;
 using WebKit::WebElement;
@@ skipping 579 matching lines @@
 bool PluginPlaceholder::IsYouTubeURL(const GURL& url,
                                        const std::string& mime_type) {
   std::string host = url.host();
   bool is_youtube = EndsWith(host, "youtube.com", true) ||
       EndsWith(host, "youtube-nocookie.com", true);
 
   return is_youtube && IsValidYouTubeVideo(url.path()) &&
       LowerCaseEqualsASCII(mime_type, kFlashPluginSwfMimeType);
 }
 #endif