Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/gtk/accelerators_gtk.cc

Index: chrome/browser/gtk/accelerators_gtk.cc
diff --git a/chrome/browser/gtk/accelerators_gtk.cc b/chrome/browser/gtk/accelerators_gtk.cc
index c0a2f73e14e5fb6608d0107be47f68c9d4425731..5456b0d5ada81512f49511357e13a876e13781ef 100644
--- a/chrome/browser/gtk/accelerators_gtk.cc
+++ b/chrome/browser/gtk/accelerators_gtk.cc
@@ -8,6 +8,7 @@
 #include <gdk/gdkkeysyms.h>
 #include <X11/XF86keysym.h>
 
+#include "base/singleton.h"
 #include "chrome/app/chrome_command_ids.h"
 
 namespace {
@@ -190,6 +191,11 @@ AcceleratorsGtk::AcceleratorsGtk() {
 
 AcceleratorsGtk::~AcceleratorsGtk() {}
 
+// static
+AcceleratorsGtk* AcceleratorsGtk::GetInstance() {
+  return Singleton<AcceleratorsGtk>::get();
+}
+
 const menus::AcceleratorGtk* AcceleratorsGtk::GetPrimaryAcceleratorForCommand(
     int command_id) {
   base::hash_map<int, menus::AcceleratorGtk>::const_iterator iter =