WorkerLoaderProxy: stop accessing cross-thread execution context

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
index e0a9d558acb65289bea90d605e977dbd72c2c208..ebae808087cf66ed33b0058781fb022bb7dde33d 100644
--- a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -262,16 +262,9 @@ void WebEmbeddedWorkerImpl::postMessageToPageInspector(const String& message) {
 
 void WebEmbeddedWorkerImpl::postTaskToLoader(
     const WebTraceLocation& location,
-    std::unique_ptr<ExecutionContextTask> task) {
-  // This cross-thread operation is brittle wrt per-thread heaps,
-  // posting a task to main-thread owned objects.
+    std::unique_ptr<WTF::CrossThreadClosure> task) {
   m_mainThreadTaskRunners->get(TaskType::Networking)
-      ->postTask(
-          BLINK_FROM_HERE,
-          crossThreadBind(
-              &ExecutionContextTask::performTaskIfContextIsValid,
-              WTF::passed(std::move(task)),
-              wrapCrossThreadWeakPersistent(m_mainFrame->frame()->document())));
+      ->postTask(BLINK_FROM_HERE, std::move(task));
 }
 
 void WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope(
@@ -282,6 +275,10 @@ void WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope(
   m_workerThread->postTask(location, std::move(task));
 }
 
+ExecutionContext* WebEmbeddedWorkerImpl::getLoaderExecutionContext() {
+  return m_mainFrame->frame()->document();
+}
+
 void WebEmbeddedWorkerImpl::prepareShadowPageForLoader() {
   // Create 'shadow page', which is never displayed and is used mainly to
   // provide a context for loading on the main thread.