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

chrome/browser/chromeos/dom_ui/menu_ui.cc

Index: chrome/browser/chromeos/dom_ui/menu_ui.cc
diff --git a/chrome/browser/chromeos/dom_ui/menu_ui.cc b/chrome/browser/chromeos/dom_ui/menu_ui.cc
index f4f5036fed7517fadf4771c2ded24cf2d9e58013..298a8ed8a9aca4353734cbf4975182ee63231b56 100644
--- a/chrome/browser/chromeos/dom_ui/menu_ui.cc
+++ b/chrome/browser/chromeos/dom_ui/menu_ui.cc
@@ -535,7 +535,7 @@ MenuUI::MenuUI(TabContents* contents) : DOMUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(CreateDataSource())));
 }
@@ -548,7 +548,7 @@ MenuUI::MenuUI(TabContents* contents, ChromeURLDataManager::DataSource* source)
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(source)));
 }