Remove support for -webkit-canvas and Document.getCSSCanvasContext.

third_party/WebKit/Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 795 matching lines @@
     // Returns the HTMLLinkElement currently in use for the Web Manifest.
     // Returns null if there is no such element.
     HTMLLinkElement* linkManifest() const;
 
     void setUseSecureKeyboardEntryWhenActive(bool);
     bool useSecureKeyboardEntryWhenActive() const;
 
     void updateFocusAppearanceSoon(bool restorePreviousSelection);
     void cancelFocusAppearanceUpdate();
 
-    // Extension for manipulating canvas drawing contexts for use in CSS
-    ScriptValue getCSSCanvasContext(ScriptState*, const String& type, const String& name, int width, int height);
-    HTMLCanvasElement& getCSSCanvasElement(const String& name);
-
     bool isDNSPrefetchEnabled() const { return m_isDNSPrefetchEnabled; }
     void parseDNSPrefetchControlHeader(const String&);
 
     // FIXME(crbug.com/305497): This should be removed once LocalDOMWindow is an ExecutionContext.
     void postTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>) override; // Executes the task on context's thread asynchronously.
     void postInspectorTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>);
 
     void tasksWereSuspended() final;
     void tasksWereResumed() final;
     void suspendScheduledTasks() final;
@@ skipping 463 matching lines @@
 #else
     unsigned m_nodeListCounts[numNodeListInvalidationTypes];
 #endif
 
     OwnPtrWillBeMember<SVGDocumentExtensions> m_svgExtensions;
 
     Vector<AnnotatedRegionValue> m_annotatedRegions;
     bool m_hasAnnotatedRegions;
     bool m_annotatedRegionsDirty;
 
-    WillBeHeapHashMap<String, RefPtrWillBeMember<HTMLCanvasElement>> m_cssCanvasElements;
-
     OwnPtr<SelectorQueryCache> m_selectorQueryCache;
 
     // It is safe to keep a raw, untraced pointer to this stack-allocated
     // cache object: it is set upon the cache object being allocated on
     // the stack and cleared upon leaving its allocated scope. Hence it
     // is acceptable not to trace it -- should a conservative GC occur,
     // the cache object's references will be traced by a stack walk.
     GC_PLUGIN_IGNORE("461878")
     NthIndexCache* m_nthIndexCache = nullptr;
 
@@ skipping 124 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h