Implement a Menu Item to Hide the Toolbar in Fullscreen

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index bbb826e1d7bf25adcc6fb2c45a7d55d8d7a842ea..21dd355d544653d30b60715e12a5e0cc4f4eca5e 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -434,18 +434,22 @@ bool BrowserWindowCocoa::IsFullscreenBubbleVisible() const {
   return false;
 }
 
-bool BrowserWindowCocoa::SupportsFullscreenWithToolbar() const {
-  return chrome::mac::SupportsSystemFullscreen();
-}
-
 void BrowserWindowCocoa::UpdateFullscreenWithToolbar(bool with_toolbar) {
   [controller_ updateFullscreenWithToolbar:with_toolbar];
 }
 
+void BrowserWindowCocoa::ToggleFullscreenToolbar() {
+  [controller_ toggleFullscreenToolbar];
+}
+
 bool BrowserWindowCocoa::IsFullscreenWithToolbar() const {
   return IsFullscreen() && ![controller_ inPresentationMode];
 }
 
+bool BrowserWindowCocoa::ShouldHideFullscreenToolbar() const {
+  return [controller_ shouldHideFullscreenToolbar];
+}
+
 void BrowserWindowCocoa::ConfirmAddSearchProvider(
     TemplateURL* template_url,
     Profile* profile) {