Replace Browser::GetTabContentsAt with GetWebContentsAt and update all callers.

chrome/browser/ui/gtk/tabs/tab_renderer_gtk.cc

Index: chrome/browser/ui/gtk/tabs/tab_renderer_gtk.cc
===================================================================
--- chrome/browser/ui/gtk/tabs/tab_renderer_gtk.cc	(revision 116244)
+++ chrome/browser/ui/gtk/tabs/tab_renderer_gtk.cc	(working copy)
@@ -41,6 +41,8 @@
 #include "ui/gfx/platform_font_pango.h"
 #include "ui/gfx/skbitmap_operations.h"
 
+using content::WebContents;
+
 #if !GTK_CHECK_VERSION(2, 22, 0)
 #define gtk_button_get_event_window(button) button->event_window
 #endif  // Gtk+ >= 2.22
@@ -322,7 +324,7 @@
       theme_service_->GetColor(ThemeService::COLOR_BACKGROUND_TAB_TEXT);
 }
 
-void TabRendererGtk::UpdateData(TabContents* contents,
+void TabRendererGtk::UpdateData(WebContents* contents,
                                 bool app,
                                 bool loading_only) {
   DCHECK(contents);