Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index 79325e82ff2f9cdc3b8cdeef767eb9a052033c20..261a762752822e939ece295049a8ad4f0317cf94 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -1246,7 +1246,7 @@ void RenderViewContextMenu::ExecuteCommand(int id) {
       TranslatePrefs prefs(profile_->GetPrefs());
       prefs.RemoveLanguageFromBlacklist(original_lang);
       prefs.RemoveSiteFromBlacklist(params_.page_url.HostNoBrackets());
-      Singleton<TranslateManager>::get()->TranslatePage(
+      TranslateManager::GetInstance()->TranslatePage(
           source_tab_contents_, original_lang, target_lang);
       break;
     }