Add a new GetInstance() method for singleton classes, take 2.

chrome/browser/renderer_host/resource_message_filter_gtk.cc

Index: chrome/browser/renderer_host/resource_message_filter_gtk.cc
diff --git a/chrome/browser/renderer_host/resource_message_filter_gtk.cc b/chrome/browser/renderer_host/resource_message_filter_gtk.cc
index 59c65880d2e2a57acf6068c68e9a5f218f6af99a..e2bf64124d93efb0575f6ce2aebfe31fa30b6d8f 100644
--- a/chrome/browser/renderer_host/resource_message_filter_gtk.cc
+++ b/chrome/browser/renderer_host/resource_message_filter_gtk.cc
@@ -69,8 +69,8 @@ void ResourceMessageFilter::DoOnGetWindowRect(gfx::NativeViewId view,
   gfx::Rect rect;
   XID window;
 
-  AutoLock lock(Singleton<GtkNativeViewManager>()->unrealize_lock());
-  if (Singleton<GtkNativeViewManager>()->GetXIDForId(&window, view)) {
+  AutoLock lock(GtkNativeViewManager::GetInstance()->unrealize_lock());
+  if (GtkNativeViewManager::GetInstance()->GetXIDForId(&window, view)) {
     if (window) {
       int x, y;
       unsigned width, height;
@@ -109,8 +109,8 @@ void ResourceMessageFilter::DoOnGetRootWindowRect(gfx::NativeViewId view,
   gfx::Rect rect;
   XID window;
 
-  AutoLock lock(Singleton<GtkNativeViewManager>()->unrealize_lock());
-  if (Singleton<GtkNativeViewManager>()->GetXIDForId(&window, view)) {
+  AutoLock lock(GtkNativeViewManager::GetInstance()->unrealize_lock());
+  if (GtkNativeViewManager::GetInstance()->GetXIDForId(&window, view)) {
     if (window) {
       const XID toplevel = GetTopLevelWindow(window);
       if (toplevel) {