Remove MainThreadTaskRunner

third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp

Index: third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
diff --git a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
index 377d45d08e1b472976f4627f60a5a6de55a19878..13ddafcdee3bb973b8c7ad690707f66af96ce1b5 100644
--- a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
+++ b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
@@ -29,13 +29,13 @@ WebTaskRunner* TaskRunnerHelper::get(TaskType type, LocalFrame* frame) {
     case TaskType::UnshippedPortMessage:
     case TaskType::Timer:
     case TaskType::Internal:
+    case TaskType::Unspecified:
       return frame ? frame->frameScheduler()->timerTaskRunner()
                    : Platform::current()->currentThread()->getWebTaskRunner();
     case TaskType::Networking:
       return frame ? frame->frameScheduler()->loadingTaskRunner()
                    : Platform::current()->currentThread()->getWebTaskRunner();
     case TaskType::Unthrottled:
-    case TaskType::Unspecified:
       return frame ? frame->frameScheduler()->unthrottledTaskRunner()
                    : Platform::current()->currentThread()->getWebTaskRunner();
   }