Convert MediaControlElements timer to UnspecedTimer per-frame TaskRunnerTimer.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp

Index: third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
index fd86d758e0c8d4c1299f4f3df03be11ce9205389..bb6da9e90b6f07dac88e6b7814d3c747a9f3e176 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
@@ -32,6 +32,7 @@
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ClientRect.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/MouseEvent.h"
@@ -134,8 +135,10 @@ MediaControlPanelElement::MediaControlPanelElement(MediaControls& mediaControls)
     : MediaControlDivElement(mediaControls, MediaControlsPanel),
       m_isDisplayed(false),
       m_opaque(true),
-      m_transitionTimer(this, &MediaControlPanelElement::transitionTimerFired) {
-}
+      m_transitionTimer(TaskRunnerHelper::get(TaskType::UnspecedTimer,
+                                              &mediaControls.document()),
+                        this,
+                        &MediaControlPanelElement::transitionTimerFired) {}
 
 MediaControlPanelElement* MediaControlPanelElement::create(
     MediaControls& mediaControls) {