Get rid of the following dependencies from content:

content/browser/plugin_service.cc

 // Copyright (c) 2011 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/browser/plugin_service.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
-#include "chrome/common/chrome_paths.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/ppapi_plugin_process_host.h"
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/resource_context.h"
 #include "content/common/content_switches.h"
 #include "content/common/notification_service.h"
 #include "content/common/notification_type.h"
 #include "content/common/pepper_plugin_registry.h"
@@ skipping 71 matching lines @@
       hklm_event_.reset(new base::WaitableEvent(hklm_key_.watch_event()));
       hklm_watcher_.StartWatching(hklm_event_.get(), this);
     }
   }
 #elif defined(OS_MACOSX)
   // We need to know when the browser comes forward so we can bring modal plugin
   // windows forward too.
   registrar_.Add(this, NotificationType::APP_ACTIVATED,
                  NotificationService::AllSources());
 #elif defined(OS_POSIX)
-  // Also find plugins in a user-specific plugins dir,
-  // e.g. ~/.config/chromium/Plugins.
-  FilePath user_data_dir;
-  if (PathService::Get(chrome::DIR_USER_DATA, &user_data_dir)) {
-    webkit::npapi::PluginList::Singleton()->AddExtraPluginDir(
-        user_data_dir.Append("Plugins"));
-  }
-
 // The FilePathWatcher produces too many false positives on MacOS (access time
 // updates?) which will lead to enforcing updates of the plugins way too often.
 // On ChromeOS the user can't install plugins anyway and on Windows all
 // important plugins register themselves in the registry so no need to do that.
   file_watcher_delegate_ = new PluginDirWatcherDelegate();
   // Get the list of all paths for registering the FilePathWatchers
   // that will track and if needed reload the list of plugins on runtime.
   std::vector<FilePath> plugin_dirs;
   webkit::npapi::PluginList::Singleton()->GetPluginDirectories(
       &plugin_dirs);
@@ skipping 369 matching lines @@
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 // static
 void PluginService::RegisterFilePathWatcher(
     FilePathWatcher *watcher,
     const FilePath& path,
     FilePathWatcher::Delegate* delegate) {
   bool result = watcher->Watch(path, delegate);
   DCHECK(result);
 }
 #endif