Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/platform/Timer.cpp

Index: third_party/WebKit/Source/platform/Timer.cpp
diff --git a/third_party/WebKit/Source/platform/Timer.cpp b/third_party/WebKit/Source/platform/Timer.cpp
index b02e8b6c8e52b447cd9e6b50c130d73445ec50f8..c0c09b8b5bb39d8101bfce48c1f7e7d508e112d7 100644
--- a/third_party/WebKit/Source/platform/Timer.cpp
+++ b/third_party/WebKit/Source/platform/Timer.cpp
@@ -40,10 +40,10 @@
 
 namespace blink {
 
-TimerBase::TimerBase(WebTaskRunner* webTaskRunner)
+TimerBase::TimerBase(RefPtr<WebTaskRunner> webTaskRunner)
     : m_nextFireTime(0),
       m_repeatInterval(0),
-      m_webTaskRunner(webTaskRunner->clone()),
+      m_webTaskRunner(std::move(webTaskRunner)),
 #if DCHECK_IS_ON()
       m_thread(currentThread()),
 #endif
@@ -86,17 +86,17 @@ double TimerBase::nextFireInterval() const {
 }
 
 // static
-WebTaskRunner* TimerBase::getTimerTaskRunner() {
+RefPtr<WebTaskRunner> TimerBase::getTimerTaskRunner() {
   return Platform::current()->currentThread()->scheduler()->timerTaskRunner();
 }
 
 // static
-WebTaskRunner* TimerBase::getUnthrottledTaskRunner() {
+RefPtr<WebTaskRunner> TimerBase::getUnthrottledTaskRunner() {
   return Platform::current()->currentThread()->getWebTaskRunner();
 }
 
-WebTaskRunner* TimerBase::timerTaskRunner() const {
-  return m_webTaskRunner.get();
+RefPtr<WebTaskRunner> TimerBase::timerTaskRunner() const {
+  return m_webTaskRunner;
 }
 
 void TimerBase::setNextFireTime(double now, double delay) {