Coverity: Pass values by reference.

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 1457 matching lines @@
   event_box_.Destroy();
   for (PixbufMap::iterator iter = pixbufs_.begin(); iter != pixbufs_.end();
        ++iter) {
     g_object_unref(iter->second);
   }
   if (last_icon_pixbuf_)
     g_object_unref(last_icon_pixbuf_);
 }
 
 void LocationBarViewGtk::PageActionViewGtk::UpdateVisibility(
-    TabContents* contents, GURL url) {
+    TabContents* contents, const GURL& url) {
   // Save this off so we can pass it back to the extension when the action gets
   // executed. See PageActionImageView::OnMousePressed.
   current_tab_id_ = contents ? ExtensionTabUtil::GetTabId(contents) : -1;
   current_url_ = url;
 
   bool visible = contents &&
       (preview_enabled_ || page_action_->GetIsVisible(current_tab_id_));
   if (visible) {
     // Set the tooltip.
     gtk_widget_set_tooltip_text(event_box_.get(),
@@ skipping 143 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;
 }