Implement a Menu Item to Hide the Toolbar in Fullscreen

chrome/browser/ui/cocoa/browser_window_cocoa.h

Index: chrome/browser/ui/cocoa/browser_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.h b/chrome/browser/ui/cocoa/browser_window_cocoa.h
index 637edc505c961ce0cdf4016a5cb27b8125130608..0b18ca3455d588c2e08d9d181ce71aef3afc386a 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.h
@@ -87,9 +87,10 @@ class BrowserWindowCocoa
   bool ShouldHideUIForFullscreen() const override;
   bool IsFullscreen() const override;
   bool IsFullscreenBubbleVisible() const override;
-  bool SupportsFullscreenWithToolbar() const override;
   void UpdateFullscreenWithToolbar(bool with_toolbar) override;
+  void ToggleFullscreenToolbar() override;
   bool IsFullscreenWithToolbar() const override;
+  bool ShouldHideFullscreenToolbar() const override;
   LocationBar* GetLocationBar() const override;
   void SetFocusToLocationBar(bool select_all) override;
   void UpdateReloadStopState(bool is_loading, bool force) override;