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

chrome/browser/dom_ui/slideshow_ui.cc

Index: chrome/browser/dom_ui/slideshow_ui.cc
diff --git a/chrome/browser/dom_ui/slideshow_ui.cc b/chrome/browser/dom_ui/slideshow_ui.cc
index 5c66e0eab29ebbd3b8e17ecb015374cd6c469f65..da8a8075d8d990886d723a93ecfc808842cdfd5e 100644
--- a/chrome/browser/dom_ui/slideshow_ui.cc
+++ b/chrome/browser/dom_ui/slideshow_ui.cc
@@ -153,7 +153,7 @@ DOMMessageHandler* SlideshowHandler::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();
@@ -288,7 +288,7 @@ SlideshowUI::SlideshowUI(TabContents* contents) : DOMUI(contents) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }