Mac: Make calling WebContents::WasShown/WasHidden the responsibility of the content layer

content/browser/web_contents/web_contents_view_aura.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 142 matching lines @@
 
   // Overridden from aura::client::DragDropDelegate:
   void OnDragEntered(const ui::DropTargetEvent& event) override;
   int OnDragUpdated(const ui::DropTargetEvent& event) override;
   void OnDragExited() override;
   int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
   // Overridden from aura::WindowObserver:
   void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
 
-  // Update the web contents visiblity.
-  void UpdateWebContentsVisibility(bool visible);
-
   FRIEND_TEST_ALL_PREFIXES(WebContentsViewAuraTest, EnableDisableOverscroll);
 
   scoped_ptr<aura::Window> window_;
 
   scoped_ptr<WindowObserver> window_observer_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   scoped_ptr<WebContentsViewDelegate> delegate_;
@@ skipping 16 matching lines @@
   // This is the completed overscroll gesture. This is used for the animation
   // callback that happens in response to a completed overscroll gesture.
   OverscrollMode completed_overscroll_gesture_;
 
   // This manages the overlay window that shows the screenshot during a history
   // navigation triggered by the overscroll gesture.
   scoped_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
   scoped_ptr<GestureNavSimple> gesture_nav_simple_;
 
-  // On Windows we can run into problems if resources get released within the
-  // initialization phase while the content (and its dimensions) are not known.
-  bool is_or_was_visible_;
-
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_