Add a URL param to indicate group selection in Instant field trial.

chrome/browser/ui/views/default_search_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_DEFAULT_SEARCH_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_DEFAULT_SEARCH_VIEW_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "content/browser/tab_contents/constrained_window.h"
 #include "views/window/dialog_delegate.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include "chrome/browser/ui/gtk/constrained_window_gtk.h"
 #endif
 
-class PrefService;
+class Profile;
 class TabContents;
 class TemplateURL;
 class TemplateURLService;
 
 namespace gfx {
 class Canvas;
 }
 
 namespace views {
 class Button;
@@ skipping 35 matching lines @@
   virtual views::Widget* GetWidget();
   virtual const views::Widget* GetWidget() const;
 
  private:
   // Takes ownership of |proposed_default_turl|.
   DefaultSearchView(TabContents* tab_contents,
                     TemplateURL* proposed_default_turl,
                     TemplateURLService* template_url_service);
 
   // Initializes the labels and controls in the view.
-  void SetupControls(PrefService* prefs);
+  void SetupControls(Profile* prefs);
 
   // Image of browser search box with grey background and bubble arrow.
   views::ImageView* background_image_;
 
   // Button for the current default search engine.
   views::View* default_provider_button_;
 
   // Button for the newly proposed search engine.
   views::View* proposed_provider_button_;
 
   // The proposed new default search engine.
   scoped_ptr<TemplateURL> proposed_turl_;
 
   TemplateURLService* template_url_service_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultSearchView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_DEFAULT_SEARCH_VIEW_H_