Revert of Use per-frame task runner in XHR

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
index 0d083a165ec71ed3e1d861082813a6a7462e4784..40bf6d2d60d8170a1ee32761932a4f93e71b3905 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.cpp
@@ -28,7 +28,6 @@
 #include "core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.h"
 
 #include "core/EventTypeNames.h"
-#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/ProgressEvent.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
@@ -78,8 +77,8 @@ Event* XMLHttpRequestProgressEventThrottle::DeferredEvent::take() {
 
 XMLHttpRequestProgressEventThrottle::XMLHttpRequestProgressEventThrottle(
     XMLHttpRequest* target)
-    : TimerBase(TaskRunnerHelper::get(TaskType::Networking,
-                                      target->getExecutionContext())),
+    : TimerBase(
+          Platform::current()->currentThread()->scheduler()->timerTaskRunner()),
       m_target(target),
       m_hasDispatchedProgressProgressEvent(false) {
   DCHECK(target);