[Mac] Restore menu position for buttons after Material Design changes.

chrome/browser/ui/cocoa/toolbar/toolbar_controller.h

Index: chrome/browser/ui/cocoa/toolbar/toolbar_controller.h
diff --git a/chrome/browser/ui/cocoa/toolbar/toolbar_controller.h b/chrome/browser/ui/cocoa/toolbar/toolbar_controller.h
index 34de04e46cff4c188aab76a3a4a8b59e52f2a67f..e3bac90223667ce01107ddcf9737ff0c65c0c100 100644
--- a/chrome/browser/ui/cocoa/toolbar/toolbar_controller.h
+++ b/chrome/browser/ui/cocoa/toolbar/toolbar_controller.h
@@ -96,6 +96,10 @@ class NotificationBridge;
   NSButton* hoveredButton_;
 }
 
+// Return the inset needed to center a toolbar button's icon within the 28x28
+// design area defined by Material Design.
++ (CGFloat)materialDesignButtonInset;
+
 // Initialize the toolbar and register for command updates. The profile is
 // needed for initializing the location bar. The browser is needed for
 // the toolbar model and back/forward menus. The resizeDelegate is used