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

chrome/browser/ui/views/location_bar/location_icon_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_icon_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 LocationIconView::LocationIconView(const LocationBarView* location_bar)
     : ALLOW_THIS_IN_INITIALIZER_LIST(click_handler_(this, location_bar)) {
   SetTooltipText(UTF16ToWide(l10n_util::GetStringUTF16(
       IDS_TOOLTIP_LOCATION_ICON)));
 }
 
 LocationIconView::~LocationIconView() {
 }
 
 bool LocationIconView::OnMousePressed(const views::MouseEvent& event) {
   // We want to show the dialog on mouse release; that is the standard behavior
   // for buttons.
   return true;
 }
 
 void LocationIconView::OnMouseReleased(const views::MouseEvent& event,
                                        bool canceled) {
   click_handler_.OnMouseReleased(event, canceled);
 }
+
+void LocationIconView::ShowTooltip(bool show) {
+  if (show) {
+    SetTooltipText(UTF16ToWide(l10n_util::GetStringUTF16(
+            IDS_TOOLTIP_LOCATION_ICON)));
+  } else {
+    SetTooltipText(L"");
+  }
+}