Worker: Remove WorkerLoaderProxy for clean-up

third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp

Index: third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp b/third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp
index e5f4ef6cd05ecb34006802cf3e09ae128ccd631e..1d68de4f452eab4759b0eb117d317b874fcc58fd 100644
--- a/third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp
+++ b/third_party/WebKit/Source/core/loader/ThreadableLoadingContext.cpp
@@ -52,6 +52,7 @@ class DocumentThreadableLoadingContext final : public ThreadableLoadingContext {
   }
 
   RefPtr<WebTaskRunner> GetTaskRunner(TaskType type) override {
+    DCHECK(IsContextThread());
     return TaskRunnerHelper::Get(type, document_.Get());
   }
 
@@ -112,6 +113,7 @@ class WorkerThreadableLoadingContext : public ThreadableLoadingContext {
   Document* GetLoadingDocument() override { return nullptr; }
 
   RefPtr<WebTaskRunner> GetTaskRunner(TaskType type) override {
+    DCHECK(IsContextThread());
     return fetch_context_->LoadingTaskRunner();
   }