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

chrome/browser/ui/views/location_bar/location_bar_view.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 "chrome/browser/ui/views/location_bar/location_bar_view.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 810 matching lines @@
       !location_entry_->model()->popup_model()->IsOpen())
     delegate_->GetInstant()->DestroyPreviewContents();
 
   update_instant_ = true;
 }
 
 void LocationBarView::OnChanged() {
   location_icon_view_->SetImage(
       ResourceBundle::GetSharedInstance().GetBitmapNamed(
           location_entry_->GetIcon()));
+  location_icon_view_->ShowTooltip(!location_entry()->IsEditingOrEmpty());
+
   Layout();
   SchedulePaint();
 
   // TODO(sky): code for updating instant is nearly identical on all platforms.
   // It sould be pushed to a common place.
   InstantController* instant = delegate_->GetInstant();
   string16 suggested_text;
   if (update_instant_ && instant && GetTabContentsWrapper()) {
     if (location_entry_->model()->user_input_in_progress() &&
         location_entry_->model()->popup_model()->IsOpen()) {
@@ skipping 375 matching lines @@
   template_url_model_ = NULL;
   ShowFirstRunBubble(bubble_type_);
 }
 
 #if defined(OS_WIN)
 bool LocationBarView::HasValidSuggestText() {
   return suggested_text_view_ && !suggested_text_view_->size().IsEmpty() &&
       !suggested_text_view_->GetText().empty();
 }
 #endif