Convert chrome_url_data_manager (previously a global) into a Singleton. This

chrome/browser/dom_ui/history_ui.cc

Index: chrome/browser/dom_ui/history_ui.cc
diff --git a/chrome/browser/dom_ui/history_ui.cc b/chrome/browser/dom_ui/history_ui.cc
index 5e78bbebfd3e75592030906cb5923ee13dcb0c50..e852ee9d2d93e09d7a6dd8c35bddc38cbeab37be 100644
--- a/chrome/browser/dom_ui/history_ui.cc
+++ b/chrome/browser/dom_ui/history_ui.cc
@@ -8,6 +8,7 @@
 #include "app/resource_bundle.h"
 #include "base/i18n/time_formatting.h"
 #include "base/message_loop.h"
+#include "base/singleton.h"
 #include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/thread.h"
@@ -113,7 +114,7 @@ DOMMessageHandler* BrowsingHistoryHandler::Attach(DOMUI* dom_ui) {
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(
-          &chrome_url_data_manager,
+          Singleton<ChromeURLDataManager>().get(),
           &ChromeURLDataManager::AddDataSource,
           new DOMUIFavIconSource(dom_ui->GetProfile())));
 
@@ -373,7 +374,7 @@ HistoryUI::HistoryUI(TabContents* contents) : DOMUI(contents) {
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(
-          &chrome_url_data_manager,
+          Singleton<ChromeURLDataManager>().get(),
           &ChromeURLDataManager::AddDataSource,
           html_source));
 }