content: Cleanup class/struct forward declarations

content/child/web_url_loader_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_
 #define CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader_factory.mojom.h"
 #include "content/public/common/resource_response.h"
 #include "net/url_request/redirect_info.h"
 #include "third_party/WebKit/public/platform/WebURLLoader.h"
 #include "url/gurl.h"
 
-namespace base {
-
-class SingleThreadTaskRunner;
-
-}  // namespace base
-
 namespace content {
 
 class ResourceDispatcher;
 struct ResourceResponseInfo;
 
 // PlzNavigate: Used to override parameters of the navigation request.
 struct CONTENT_EXPORT StreamOverrideParameters {
  public:
   StreamOverrideParameters();
   ~StreamOverrideParameters();
@@ skipping 43 matching lines @@
   class Context;
   class RequestPeerImpl;
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLLoaderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEB_URL_LOADER_IMPL_H_