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

chrome/browser/dom_ui/bug_report_ui.cc

Index: chrome/browser/dom_ui/bug_report_ui.cc
diff --git a/chrome/browser/dom_ui/bug_report_ui.cc b/chrome/browser/dom_ui/bug_report_ui.cc
index 74ac6298861a857eaaa200ef75fb600b65a4dcb2..4d8bc83b7e9896eb424a025eddae264f3cea5832 100644
--- a/chrome/browser/dom_ui/bug_report_ui.cc
+++ b/chrome/browser/dom_ui/bug_report_ui.cc
@@ -511,7 +511,7 @@ void BugReportHandler::ClobberScreenshotsSource() {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(new DOMUIScreenshotSource(NULL))));
 
@@ -530,7 +530,7 @@ void BugReportHandler::SetupScreenshotsSource() {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(screenshot_source_)));
 }
@@ -803,7 +803,7 @@ BugReportUI::BugReportUI(TabContents* tab) : HtmlDialogUI(tab) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }