Make WebTaskRunner ThreadSafeRefCounted

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 f733694c25d01f428614979f336100bb42d9106b..4916bf0f382943f6cf5122e3d93ef28c2976ae2f 100644
--- a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
+++ b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.cpp
@@ -13,7 +13,7 @@
 
 namespace blink {
 
-WebTaskRunner* TaskRunnerHelper::get(TaskType type, LocalFrame* frame) {
+RefPtr<WebTaskRunner> TaskRunnerHelper::get(TaskType type, LocalFrame* frame) {
   // TODO(haraken): Optimize the mapping from TaskTypes to task runners.
   switch (type) {
     case TaskType::DOMManipulation:
@@ -43,18 +43,20 @@ WebTaskRunner* TaskRunnerHelper::get(TaskType type, LocalFrame* frame) {
   return nullptr;
 }
 
-WebTaskRunner* TaskRunnerHelper::get(TaskType type, Document* document) {
+RefPtr<WebTaskRunner> TaskRunnerHelper::get(TaskType type, Document* document) {
   return get(type, document ? document->frame() : nullptr);
 }
 
-WebTaskRunner* TaskRunnerHelper::get(TaskType type,
-                                     ExecutionContext* executionContext) {
+RefPtr<WebTaskRunner> TaskRunnerHelper::get(
+    TaskType type,
+    ExecutionContext* executionContext) {
   return get(type, executionContext && executionContext->isDocument()
                        ? static_cast<Document*>(executionContext)
                        : nullptr);
 }
 
-WebTaskRunner* TaskRunnerHelper::get(TaskType type, ScriptState* scriptState) {
+RefPtr<WebTaskRunner> TaskRunnerHelper::get(TaskType type,
+                                            ScriptState* scriptState) {
   return get(type, scriptState ? scriptState->getExecutionContext() : nullptr);
 }