Mac: Clean up visibility state tracking

content/browser/renderer_host/render_widget_host_view_mac.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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurface.h>
 #include <stddef.h>
@@ skipping 427 matching lines @@
   // and for any CALayers, and the screen color profile.
   void UpdateBackingStoreProperties();
 
   // Ensure that the display link is associated with the correct display.
   void UpdateDisplayLink();
 
   void PauseForPendingResizeOrRepaintsAndDraw();
 
   // BrowserCompositorMacClient implementation.
   NSView* BrowserCompositorMacGetNSView() const override;
-  bool BrowserCompositorMacIsVisible() const override;
   SkColor BrowserCompositorMacGetGutterColor(SkColor color) const override;
   void BrowserCompositorMacSendCompositorSwapAck(
       int output_surface_id,
       const cc::CompositorFrameAck& ack) override;
   void BrowserCompositorMacSendReclaimCompositorResources(
       int output_surface_id,
       const cc::CompositorFrameAck& ack) override;
   void BrowserCompositorMacOnLostCompositorResources() override;
   void BrowserCompositorMacUpdateVSyncParameters(
       const base::TimeTicks& timebase,
@@ skipping 82 matching lines @@
 
   // Factory used to safely scope delayed calls to ShutdownHost().
   base::WeakPtrFactory<RenderWidgetHostViewMac> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_