Simplify calls for scale factor

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 413 matching lines @@
   }
 
   CONTENT_EXPORT void release_pepper_fullscreen_window_for_testing();
 
   RenderWidgetHostViewMac* fullscreen_parent_host_view() const {
     return fullscreen_parent_host_view_;
   }
 
   int window_number() const;
 
-  // The scale factor for the screen that the view is currently on.
-  float ViewScaleFactor() const;
-
   // Update properties, such as the scale factor for the backing store
   // 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.
@@ skipping 99 matching lines @@
   // to SendVSyncParametersToRenderer(), and refreshed regularly thereafter.
   base::TimeTicks vsync_timebase_;
   base::TimeDelta vsync_interval_;
 
   // Whether a request for begin frames has been issued.
   bool needs_begin_frames_;
 
   // Whether a request to flush input has been issued.
   bool needs_flush_input_;
 
+  // Device scale factor. Updated when the display metric is updated.
+  float device_scale_factor_;
+
   // 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_