Make DisplayItemClient an interface

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 317 matching lines @@
 WebPluginContainerImpl* WebLocalFrameImpl::pluginContainerFromNode(LocalFrame* frame, const WebNode& node)
 {
     WebPluginContainerImpl* pluginContainer = pluginContainerFromFrame(frame);
     if (pluginContainer)
         return pluginContainer;
     return toWebPluginContainerImpl(node.pluginContainer());
 }
 
 // Simple class to override some of PrintContext behavior. Some of the methods
 // made virtual so that they can be overridden by ChromePluginPrintContext.
-class ChromePrintContext : public PrintContext {
+class ChromePrintContext : public PrintContext, public DisplayItemClient {
     WTF_MAKE_NONCOPYABLE(ChromePrintContext);
 public:
     ChromePrintContext(LocalFrame* frame)
         : PrintContext(frame)
         , m_printedPageWidth(0)
     {
     }
 
     ~ChromePrintContext() override {}
 
@@ skipping 82 matching lines @@
 #endif
             TransformRecorder transformRecorder(context, *this, transform);
             spoolPage(context, pageIndex);
 
             currentHeight += pageSizeInPixels.height() + 1;
         }
         pictureBuilder.endRecording()->playback(canvas);
         outputLinkedDestinations(canvas, allPagesRect);
     }
 
-    DisplayItemClient displayItemClient() const { return toDisplayItemClient(this); }
-
-    String debugName() const { return "ChromePrintContext"; }
+    String debugName() const final { return "ChromePrintContext"; }
 
 protected:
     // Spools the printed page, a subrect of frame(). Skip the scale step.
     // NativeTheme doesn't play well with scaling. Scaling is done browser side
     // instead. Returns the scale to be applied.
     // On Linux, we don't have the problem with NativeTheme, hence we let WebKit
     // do the scaling and ignore the return value.
     virtual float spoolPage(GraphicsContext& context, int pageNumber)
     {
         IntRect pageRect = m_pageRects[pageNumber];
@@ skipping 1793 matching lines @@
 }
 
 WebSandboxFlags WebLocalFrameImpl::effectiveSandboxFlags() const
 {
     if (!frame())
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 } // namespace blink