Move SetMediaKeysHandler timer to frame-specific TaskRunnerTimer.

third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp

Index: third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp b/third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp
index 9f7e9c710b173e7829685c625b8a1ed9516b8641..44f9ad9f2d7c6c7569bee6e6f12091c126d97353 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp
+++ b/third_party/WebKit/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp
@@ -12,6 +12,7 @@
 #include "core/dom/DOMException.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/html/HTMLMediaElement.h"
 #include "modules/encryptedmedia/ContentDecryptionModuleResultPromise.h"
 #include "modules/encryptedmedia/EncryptedMediaUtils.h"
@@ -51,7 +52,7 @@ class SetMediaKeysHandler : public ScriptPromiseResolver {
   Member<HTMLMediaElement> m_element;
   Member<MediaKeys> m_newMediaKeys;
   bool m_madeReservation;
-  Timer<SetMediaKeysHandler> m_timer;
+  TaskRunnerTimer<SetMediaKeysHandler> m_timer;
 };
 
 typedef Function<void()> SuccessCallback;
@@ -123,7 +124,9 @@ SetMediaKeysHandler::SetMediaKeysHandler(ScriptState* scriptState,
       m_element(element),
       m_newMediaKeys(mediaKeys),
       m_madeReservation(false),
-      m_timer(this, &SetMediaKeysHandler::timerFired) {
+      m_timer(TaskRunnerHelper::get(TaskType::MiscPlatformAPI, scriptState),
+              this,
+              &SetMediaKeysHandler::timerFired) {
   DVLOG(EME_LOG_LEVEL) << __func__;
 
   // 5. Run the following steps in parallel.