WebSocket: Remove unused DocumentWebSocketChannel::LoadingContext()

Bug: n/a
Change-Id: I26db9c9ffbbfc55245f6ddc29c1e8088047e91c2
Reviewed-on: https://chromium-review.googlesource.com/959463Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542732}

third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.cpp

@@ -558,10 +558,6 @@ void DocumentWebSocketChannel::HandleDidClose(bool was_clean,
   // client->DidClose may delete this object.
 }
 
-ThreadableLoadingContext* DocumentWebSocketChannel::LoadingContext() {
-  return loading_context_;
-}
-
 Document* DocumentWebSocketChannel::GetDocument() {
   ExecutionContext* context = loading_context_->GetExecutionContext();
   if (context->IsDocument())

third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h

@@ -55,7 +55,6 @@
 
 namespace blink {
 
-class ThreadableLoadingContext;
 class WebSocketHandshakeRequest;
 class WebSocketHandshakeThrottle;
 
@@ -152,7 +151,6 @@ class MODULES_EXPORT DocumentWebSocketChannel final
   void HandleDidClose(bool was_clean,
                       unsigned short code,
                       const String& reason);
-  ThreadableLoadingContext* LoadingContext();
 
   // This may return nullptr.
   // TODO(kinuko): Remove dependency to document.