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

chrome/browser/dom_ui/mediaplayer_ui.cc

Index: chrome/browser/dom_ui/mediaplayer_ui.cc
diff --git a/chrome/browser/dom_ui/mediaplayer_ui.cc b/chrome/browser/dom_ui/mediaplayer_ui.cc
index 7a260008abddb9aa2654a2811cff14cae53f1881..2fb141c6bc9df405c2fd4e384d0e3451d1f67d3e 100644
--- a/chrome/browser/dom_ui/mediaplayer_ui.cc
+++ b/chrome/browser/dom_ui/mediaplayer_ui.cc
@@ -212,7 +212,7 @@ DOMMessageHandler* MediaplayerHandler::Attach(DOMUI* dom_ui) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(new DOMUIFavIconSource(dom_ui->GetProfile()))));
 
@@ -610,7 +610,7 @@ MediaplayerUI::MediaplayerUI(TabContents* contents) : DOMUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }