Provide a method to remove inserted style sheet

third_party/WebKit/Source/web/WebDocument.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 164 matching lines @@
 }
 
 WebElement WebDocument::GetElementById(const WebString& id) const {
   return WebElement(ConstUnwrap<Document>()->getElementById(id));
 }
 
 WebElement WebDocument::FocusedElement() const {
   return WebElement(ConstUnwrap<Document>()->FocusedElement());
 }
 
-void WebDocument::InsertStyleSheet(const WebString& source_code) {
+WebStyleSheetId WebDocument::InsertStyleSheet(const WebString& source_code) {
   Document* document = Unwrap<Document>();
   DCHECK(document);
   StyleSheetContents* parsed_sheet =
       StyleSheetContents::Create(CSSParserContext::Create(*document));
   parsed_sheet->ParseString(source_code);
-  document->GetStyleEngine().InjectAuthorSheet(parsed_sheet);
+  return document->GetStyleEngine().InjectAuthorSheet(parsed_sheet);
+}
+
+void WebDocument::RemoveInsertedStyleSheet(WebStyleSheetId stylesheet_id) {
+  Unwrap<Document>()->GetStyleEngine().RemoveInjectedAuthorSheet(stylesheet_id);
 }
 
 void WebDocument::WatchCSSSelectors(const WebVector<WebString>& web_selectors) {
   Document* document = Unwrap<Document>();
   CSSSelectorWatch* watch = CSSSelectorWatch::FromIfExists(*document);
   if (!watch && web_selectors.empty())
     return;
   Vector<String> selectors;
   selectors.Append(web_selectors.Data(), web_selectors.size());
   CSSSelectorWatch::From(*document).WatchCSSSelectors(selectors);
@@ skipping 94 matching lines @@
 WebDocument& WebDocument::operator=(Document* elem) {
   private_ = elem;
   return *this;
 }
 
 WebDocument::operator Document*() const {
   return ToDocument(private_.Get());
 }
 
 }  // namespace blink