Clean up forward declarations in WebKit/Source

Source/modules/fetch/FetchRequestData.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 FetchRequestData_h
 #define FetchRequestData_h
 
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
 #include "public/platform/WebURLRequest.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class BlobDataHandle;
-class ExecutionContext;
 class FetchHeaderList;
 class SecurityOrigin;
 class WebServiceWorkerRequest;
 
 class FetchRequestData final : public GarbageCollectedFinalized<FetchRequestData> {
     WTF_MAKE_NONCOPYABLE(FetchRequestData);
 public:
     enum Tainting { BasicTainting, CORSTainting, OpaqueTainting };
 
     class Referrer final {
@@ skipping 76 matching lines @@
     WebURLRequest::FetchCredentialsMode m_credentials;
     // FIXME: Support m_useURLCredentialsFlag;
     // FIXME: Support m_manualRedirectFlag;
     // FIXME: Support m_redirectCount;
     Tainting m_responseTainting;
 };
 
 } // namespace blink
 
 #endif // FetchRequestData_h