Make WebTaskRunner ThreadSafeRefCounted

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 6a16bd65abd80b8516e48981e63ba8bc0fbb0567..1ac98c9fbccec165bb11b4260f2f8a2a414e3cee 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -485,7 +485,7 @@ Document::Document(const DocumentInit& initializer,
           TaskRunnerHelper::get(TaskType::Internal, this),
           this,
           &Document::didAssociateFormControlsTimerFired),
-      m_timers(TaskRunnerHelper::get(TaskType::Timer, this)->clone()),
+      m_timers(TaskRunnerHelper::get(TaskType::Timer, this)),
       m_hasViewportUnits(false),
       m_parserSyncPolicy(AllowAsynchronousParsing),
       m_nodeCount(0),
@@ -2488,11 +2488,8 @@ void Document::shutdown() {
     clearImportsController();
   }
 
-  m_timers.setTimerTaskRunner(Platform::current()
-                                  ->currentThread()
-                                  ->scheduler()
-                                  ->timerTaskRunner()
-                                  ->clone());
+  m_timers.setTimerTaskRunner(
+      Platform::current()->currentThread()->scheduler()->timerTaskRunner());
 
   if (m_mediaQueryMatcher)
     m_mediaQueryMatcher->documentDetached();