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

chrome/browser/dom_ui/options/options_ui.cc

Index: chrome/browser/dom_ui/options/options_ui.cc
diff --git a/chrome/browser/dom_ui/options/options_ui.cc b/chrome/browser/dom_ui/options/options_ui.cc
index 82e9cb160c8ee372fd93c5a372422c9962c7366b..5a38d849d1f664b03bbeba2ff567c3a53e550152 100644
--- a/chrome/browser/dom_ui/options/options_ui.cc
+++ b/chrome/browser/dom_ui/options/options_ui.cc
@@ -192,7 +192,7 @@ OptionsUI::OptionsUI(TabContents* contents) : DOMUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 
@@ -201,7 +201,7 @@ OptionsUI::OptionsUI(TabContents* contents) : DOMUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(theme)));
 }