Convert PlatformEventController Timer to use Unspeced frame-based timer.

BUG=624694

Review-Url: https://codereview.chromium.org/2648433003
Cr-Commit-Position: refs/heads/master@{#447883}

third_party/WebKit/Source/core/frame/PlatformEventController.cpp

@@ -12,7 +12,9 @@ PlatformEventController::PlatformEventController(LocalFrame* frame)
     : PageVisibilityObserver(frame ? frame->page() : nullptr),
       m_hasEventListener(false),
       m_isActive(false),
-      m_timer(this, &PlatformEventController::oneShotCallback) {}
+      m_timer(TaskRunnerHelper::get(TaskType::UnspecedTimer, frame),
+              this,
+              &PlatformEventController::oneShotCallback) {}
 
 PlatformEventController::~PlatformEventController() {}
 

third_party/WebKit/Source/core/frame/PlatformEventController.h

@@ -6,6 +6,7 @@
 #define PlatformEventController_h
 
 #include "core/CoreExport.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/page/PageVisibilityObserver.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
@@ -44,7 +45,7 @@ class CORE_EXPORT PlatformEventController : public PageVisibilityObserver {
   void oneShotCallback(TimerBase*);
 
   bool m_isActive;
-  Timer<PlatformEventController> m_timer;
+  TaskRunnerTimer<PlatformEventController> m_timer;
 };
 
 }  // namespace blink