Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
index ab1e39d240c61e3cbf4c996e1c441590613322d7..d3d8d1ed36c91d0f28aba5ba2016f8c71dde1c23 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -133,7 +133,7 @@ HTMLDocumentParser::HTMLDocumentParser(Document& document,
                       ? HTMLTokenizer::create(m_options)
                       : nullptr),
       m_loadingTaskRunner(
-          TaskRunnerHelper::get(TaskType::Networking, &document)->clone()),
+          TaskRunnerHelper::get(TaskType::Networking, &document)),
       m_parserScheduler(
           syncPolicy == AllowAsynchronousParsing
               ? HTMLParserScheduler::create(this, m_loadingTaskRunner.get())
@@ -851,8 +851,8 @@ void HTMLDocumentParser::startBackgroundParser() {
 
   // The background parser is created on the main thread, but may otherwise
   // only be used from the parser thread.
-  m_backgroundParser = BackgroundHTMLParser::create(
-      std::move(config), m_loadingTaskRunner->clone());
+  m_backgroundParser =
+      BackgroundHTMLParser::create(std::move(config), m_loadingTaskRunner);
   // TODO(csharrison): This is a hack to initialize MediaValuesCached on the
   // correct thread. We should get rid of it.
   postTaskToLookaheadParser(