Move RTCDataChannel timer to frame-specific TaskRunnerTimer.

third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp
index 890202a3a1607bec4574325ca44ebadb009c925d..afdf569ae6f3e22c4708c000811ad79591c1f34a 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCDataChannel.cpp
@@ -29,6 +29,7 @@
 #include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/MessageEvent.h"
 #include "core/fileapi/Blob.h"
 #include "modules/peerconnection/RTCPeerConnection.h"
@@ -88,7 +89,10 @@ RTCDataChannel::RTCDataChannel(
       m_handler(std::move(handler)),
       m_readyState(ReadyStateConnecting),
       m_binaryType(BinaryTypeArrayBuffer),
-      m_scheduledEventTimer(this, &RTCDataChannel::scheduledEventTimerFired),
+      m_scheduledEventTimer(
+          TaskRunnerHelper::get(TaskType::Networking, context),
+          this,
+          &RTCDataChannel::scheduledEventTimerFired),
       m_bufferedAmountLowThreshold(0U),
       m_stopped(false) {
   m_handler->setClient(this);