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

chrome/browser/dom_ui/options/browser_options_handler.cc

Index: chrome/browser/dom_ui/options/browser_options_handler.cc
diff --git a/chrome/browser/dom_ui/options/browser_options_handler.cc b/chrome/browser/dom_ui/options/browser_options_handler.cc
index c8e7b18a062a7146cf3b0c84d46e53a4f49c1e7d..483e64033131204b8dee105fabfb2cfbb7595bf9 100644
--- a/chrome/browser/dom_ui/options/browser_options_handler.cc
+++ b/chrome/browser/dom_ui/options/browser_options_handler.cc
@@ -115,7 +115,7 @@ void BrowserOptionsHandler::Initialize() {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(new DOMUIFavIconSource(dom_ui_->GetProfile()))));