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

chrome/browser/dom_ui/filebrowse_ui.cc

Index: chrome/browser/dom_ui/filebrowse_ui.cc
diff --git a/chrome/browser/dom_ui/filebrowse_ui.cc b/chrome/browser/dom_ui/filebrowse_ui.cc
index 6b7401be09420fc6aa113e2134166093de47e594..764b3103670a37f96dfa7a3415fdce0ca3d7a468 100644
--- a/chrome/browser/dom_ui/filebrowse_ui.cc
+++ b/chrome/browser/dom_ui/filebrowse_ui.cc
@@ -422,7 +422,7 @@ DOMMessageHandler* FilebrowseHandler::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()))));
   profile_ = dom_ui->GetProfile();
@@ -1129,7 +1129,7 @@ FileBrowseUI::FileBrowseUI(TabContents* contents) : HtmlDialogUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }