Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/ui/views/toolbar_view.cc

Index: chrome/browser/ui/views/toolbar_view.cc
diff --git a/chrome/browser/ui/views/toolbar_view.cc b/chrome/browser/ui/views/toolbar_view.cc
index 5163c9d80a76a417065784855bec8e60eb595bcb..73a4be375589baf53a628876022e32b2432735ea 100644
--- a/chrome/browser/ui/views/toolbar_view.cc
+++ b/chrome/browser/ui/views/toolbar_view.cc
@@ -233,7 +233,7 @@ void ToolbarView::Init(Profile* profile) {
   SetProfile(profile);
 
   // Accessibility specific tooltip text.
-  if (Singleton<BrowserAccessibilityState>()->IsAccessibleBrowser()) {
+  if (BrowserAccessibilityState::GetInstance()->IsAccessibleBrowser()) {
     back_->SetTooltipText(l10n_util::GetString(IDS_ACCNAME_TOOLTIP_BACK));
     forward_->SetTooltipText(l10n_util::GetString(IDS_ACCNAME_TOOLTIP_FORWARD));
   }
@@ -628,7 +628,7 @@ bool ToolbarView::IsUpgradeRecommended() {
   return (chromeos::CrosLibrary::Get()->GetUpdateLibrary()->status().status ==
           chromeos::UPDATE_STATUS_UPDATED_NEED_REBOOT);
 #else
-  return (Singleton<UpgradeDetector>::get()->notify_upgrade());
+  return (UpgradeDetector::GetInstance()->notify_upgrade());
 #endif
 }