Revert of Make NavigationScheduler post loading tasks instead of timers

Source/core/loader/NavigationScheduler.cpp

Index: Source/core/loader/NavigationScheduler.cpp
diff --git a/Source/core/loader/NavigationScheduler.cpp b/Source/core/loader/NavigationScheduler.cpp
index fb383ba36357f39070c5ddb80384382b3addf2c4..2841a7980c71c1b8148245126de3899c5819f461 100644
--- a/Source/core/loader/NavigationScheduler.cpp
+++ b/Source/core/loader/NavigationScheduler.cpp
@@ -48,7 +48,6 @@
 #include "core/page/Page.h"
 #include "platform/SharedBuffer.h"
 #include "platform/UserGestureIndicator.h"
-#include "public/platform/Platform.h"
 #include "wtf/CurrentTime.h"
 
 namespace blink {
@@ -267,7 +266,7 @@
 
 NavigationScheduler::NavigationScheduler(LocalFrame* frame)
     : m_frame(frame)
-    , m_navigateTaskFactory(WTF::bind(&NavigationScheduler::navigateTask, this))
+    , m_timer(this, &NavigationScheduler::timerFired)
     , m_navigationDisableCount(0)
 {
 }
@@ -372,7 +371,7 @@
     schedule(ScheduledReload::create());
 }
 
-void NavigationScheduler::navigateTask()
+void NavigationScheduler::timerFired(Timer<NavigationScheduler>*)
 {
     if (!m_frame->page())
         return;
@@ -414,22 +413,20 @@
         return;
 
     ASSERT(m_frame->page());
-    if (m_navigateTaskFactory.isPending())
+    if (m_timer.isActive())
         return;
     if (!m_redirect->shouldStartTimer(m_frame))
         return;
 
-    Platform::current()->currentThread()->scheduler()->loadingTaskRunner()->postDelayedTask(
-        FROM_HERE, m_navigateTaskFactory.cancelAndCreate(), m_redirect->delay());
-
+    m_timer.startOneShot(m_redirect->delay(), FROM_HERE);
     InspectorInstrumentation::frameScheduledNavigation(m_frame, m_redirect->delay());
 }
 
 void NavigationScheduler::cancel()
 {
-    if (m_navigateTaskFactory.isPending())
+    if (m_timer.isActive())
         InspectorInstrumentation::frameClearedScheduledNavigation(m_frame);
-    m_navigateTaskFactory.cancel();
+    m_timer.stop();
     m_redirect.clear();
 }