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

chrome/browser/ui/gtk/location_bar_view_gtk.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/gtk/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 927 matching lines @@
     if (gtk_util::IsActingAsRoundedWindow(site_type_event_box_)) {
       gtk_util::StopActingAsRoundedWindow(site_type_event_box_);
 
       gtk_event_box_set_visible_window(GTK_EVENT_BOX(site_type_event_box_),
                                        FALSE);
     }
 
     gtk_widget_hide(GTK_WIDGET(security_info_label_));
   }
 
+  if (location_entry()->IsEditingOrEmpty()) {
+    // Do not show the tooltip if the user has been editing the location
+    // bar, or the location bar is at the NTP.
+    gtk_widget_set_tooltip_text(location_icon_image_, "");
+  } else {
+    gtk_widget_set_tooltip_text(location_icon_image_,
+        l10n_util::GetStringUTF8(IDS_TOOLTIP_LOCATION_ICON).c_str());
+  }
+
   gtk_widget_show(site_type_area());
 
   SetSiteTypeDragSource();
 }
 
 void LocationBarViewGtk::UpdateEVCertificateLabelSize() {
   // Figure out the width of the average character.
   PangoLayout* layout = gtk_label_get_layout(GTK_LABEL(security_info_label_));
   PangoContext* context = pango_layout_get_context(layout);
   PangoFontMetrics* metrics = pango_context_get_metrics(
@@ skipping 591 matching lines @@
 
   std::string badge_text = page_action_->GetBadgeText(tab_id);
   if (badge_text.empty())
     return FALSE;
 
   gfx::CanvasSkiaPaint canvas(event, false);
   gfx::Rect bounding_rect(widget->allocation);
   page_action_->PaintBadge(&canvas, bounding_rect, tab_id);
   return FALSE;
 }