Remove TODO comment in WorkerFetchContext.h

WorkerFetchContext implements all virtual methods of BaseFetchContext now.

Bug: 443374
Change-Id: Ib8071cd74963c0fff5298a05d0d70a0728aace29
Reviewed-on: https://chromium-review.googlesource.com/597558Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491382}

third_party/WebKit/Source/core/loader/WorkerFetchContext.h

@@ -26,9 +26,7 @@ CORE_EXPORT void ProvideWorkerFetchContextToWorker(
 
 // The WorkerFetchContext is a FetchContext for workers (dedicated, shared and
 // service workers) and threaded worklets (animation and audio worklets). This
-// class is used only when off-main-thread-fetch is enabled, and is still under
-// development.
-// TODO(horo): Implement all methods of FetchContext. crbug.com/443374
+// class is used only when off-main-thread-fetch is enabled.
 class WorkerFetchContext final : public BaseFetchContext {
  public:
   static WorkerFetchContext* Create(WorkerOrWorkletGlobalScope&);