Revert of Associate SuspendableTimer with frame's timer task queue.

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

 /*
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 #include "core/frame/SuspendableTimer.h"
 
-#include "core/dom/TaskRunnerHelper.h"
-
 namespace blink {
 
 namespace {
 // The lowest value returned by TimerBase::nextUnalignedFireInterval is 0.0
 const double kNextFireIntervalInvalid = -1.0;
 }
 
 SuspendableTimer::SuspendableTimer(ExecutionContext* context)
-    : TimerBase(TaskRunnerHelper::get(TaskType::Timer, context))
+    : TimerBase(TimerBase::getTimerTaskRunner())
     , ActiveDOMObject(context)
     , m_nextFireInterval(kNextFireIntervalInvalid)
     , m_repeatInterval(0)
 #if ENABLE(ASSERT)
     , m_suspended(false)
 #endif
 {
-    DCHECK(context);
 }
 
 SuspendableTimer::~SuspendableTimer()
 {
 }
 
 void SuspendableTimer::stop()
 {
     m_nextFireInterval = kNextFireIntervalInvalid;
     TimerBase::stop();
@@ skipping 21 matching lines @@
 #endif
     if (m_nextFireInterval >= 0.0) {
         // start() was called before, therefore location() is already set.
         // m_nextFireInterval is only set in suspend() if the Timer was active.
         start(m_nextFireInterval, m_repeatInterval, location());
         m_nextFireInterval = kNextFireIntervalInvalid;
     }
 }
 
 } // namespace blink