views: Do not show up a tooltip when hovering on the magnifying glass on NTP.

chrome/browser/ui/views/location_bar/location_icon_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_LOCATION_BAR_LOCATION_ICON_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_ICON_VIEW_H_
 #pragma once
 
 #include "chrome/browser/ui/views/location_bar/click_handler.h"
 #include "views/controls/image_view.h"
 
 class LocationBarView;
 namespace views {
 class MouseEvent;
 }
 
 // LocationIconView is used to display an icon to the left of the edit field.
 // This shows the user's current action while editing, the page security
 // status on https pages, or a globe for other URLs.
 class LocationIconView : public views::ImageView {
  public:
   explicit LocationIconView(const LocationBarView* location_bar);
   virtual ~LocationIconView();
 
-  // Overridden from view.
+  // Overridden from views::ImageView:
   virtual bool OnMousePressed(const views::MouseEvent& event);
   virtual void OnMouseReleased(const views::MouseEvent& event, bool canceled);
 
+  // Whether we should show the tooltip for this icon or not.
+  void ShowTooltip(bool show);
+
  private:
   ClickHandler click_handler_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(LocationIconView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_ICON_VIEW_H_