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

chrome/browser/ui/cocoa/toolbar_controller.mm

Index: chrome/browser/ui/cocoa/toolbar_controller.mm
diff --git a/chrome/browser/ui/cocoa/toolbar_controller.mm b/chrome/browser/ui/cocoa/toolbar_controller.mm
index 669657b58647fc30ece0081c1e0b3e160b01702e..bb6f433b484cbd7b2fce4258e75d957b0c11eea4 100644
--- a/chrome/browser/ui/cocoa/toolbar_controller.mm
+++ b/chrome/browser/ui/cocoa/toolbar_controller.mm
@@ -104,7 +104,7 @@ class WrenchAcceleratorDelegate : public menus::AcceleratorProvider {
     // string gets copied, too.
     menus::AcceleratorCocoa* out_accelerator =
         static_cast<menus::AcceleratorCocoa*>(accelerator_generic);
-    AcceleratorsCocoa* keymap = Singleton<AcceleratorsCocoa>::get();
+    AcceleratorsCocoa* keymap = AcceleratorsCocoa::GetInstance();
     const menus::AcceleratorCocoa* accelerator =
         keymap->GetAcceleratorForCommand(command_id);
     if (accelerator) {
@@ -226,7 +226,7 @@ class NotificationBridge : public NotificationObserver {
   [homeButton_ setImage:nsimage_cache::ImageNamed(kHomeButtonImageName)];
   [wrenchButton_ setImage:nsimage_cache::ImageNamed(kWrenchButtonImageName)];
 
-  if (Singleton<UpgradeDetector>::get()->notify_upgrade())
+  if (UpgradeDetector::GetInstance()->notify_upgrade())
     [self badgeWrenchMenu];
 
   [backButton_ setShowsBorderOnlyWhileMouseInside:YES];