Use refs for GraphicsContext

third_party/WebKit/Source/web/WebPluginContainerImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 120 matching lines @@
     // interface methods are called only if this method returns true.
     bool supportsPaginatedPrint() const;
     // If the plugin content should not be scaled to the printable area of
     // the page, then this method should return true.
     bool isPrintScalingDisabled() const;
     // Returns true on success and sets the out parameter to the print preset options for the document.
     bool getPrintPresetOptionsFromDocument(WebPrintPresetOptions*) const;
     // Sets up printing at the specified WebPrintParams. Returns the number of pages to be printed at these settings.
     int printBegin(const WebPrintParams&) const;
     // Prints the page specified by pageNumber (0-based index) into the supplied canvas.
-    void printPage(int pageNumber, GraphicsContext*, const IntRect& paintRect);
+    void printPage(int pageNumber, GraphicsContext&, const IntRect& paintRect);
     // Ends the print operation.
     void printEnd();
 
     // Copy the selected text.
     void copy();
 
     // Pass the edit command to the plugin.
     bool executeEditCommand(const WebString& name);
     bool executeEditCommand(const WebString& name, const WebString& value);
 
@@ skipping 62 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebPluginContainerImpl, Widget, widget, widget->isPluginContainer(), widget.isPluginContainer());
 // Unlike Widget, we need not worry about object type for container.
 // WebPluginContainerImpl is the only subclass of WebPluginContainer.
 DEFINE_TYPE_CASTS(WebPluginContainerImpl, WebPluginContainer, container, true, true);
 
 } // namespace blink
 
 #endif