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

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 9f45c60b2bb0de88f1188267a2f9ed55856efe60..2afcc407dadec1115e931cb62274d99ee9d5c0de 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -592,8 +592,6 @@ void Document::dispose()
 
     m_markers->clear();
 
-    m_cssCanvasElements.clear();
-
     // FIXME: consider using ActiveDOMObject.
     if (m_scriptedAnimationController)
         m_scriptedAnimationController->clearDocumentPointer();
@@ -4912,28 +4910,6 @@ void Document::detachRange(Range* range)
     m_ranges.remove(range);
 }
 
-ScriptValue Document::getCSSCanvasContext(ScriptState* scriptState, const String& type, const String& name, int width, int height)
-{
-    HTMLCanvasElement& element = getCSSCanvasElement(name);
-    element.setSize(IntSize(width, height));
-    CanvasRenderingContext* context = element.getCanvasRenderingContext(type, CanvasContextCreationAttributes());
-    if (!context) {
-        return ScriptValue::createNull(scriptState);
-    }
-
-    return ScriptValue(scriptState, toV8(context, scriptState->context()->Global(), scriptState->isolate()));
-}
-
-HTMLCanvasElement& Document::getCSSCanvasElement(const String& name)
-{
-    RefPtrWillBeMember<HTMLCanvasElement>& element = m_cssCanvasElements.add(name, nullptr).storedValue->value;
-    if (!element) {
-        element = HTMLCanvasElement::create(*this);
-        element->setAccelerationDisabled(true);
-    }
-    return *element;
-}
-
 void Document::initDNSPrefetch()
 {
     Settings* settings = this->settings();