[Fetch API] Remove DrainingBuffer.

Source/modules/fetch/Request.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 Request_h
 #define Request_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/fetch/Body.h"
 #include "modules/fetch/FetchRequestData.h"
 #include "modules/fetch/Headers.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebURLRequest.h"
-#include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class BodyStreamBuffer;
 class RequestInit;
 class WebServiceWorkerRequest;
 
-typedef RequestOrUSVString RequestInfo;
+using RequestInfo = RequestOrUSVString;
 
 class MODULES_EXPORT Request final : public Body {
     DEFINE_WRAPPERTYPEINFO();
+    WTF_MAKE_NONCOPYABLE(Request);
 public:
-    ~Request() override { }
+    ~Request() override {}
 
     // From Request.idl:
     static Request* create(ScriptState*, const RequestInfo&, const Dictionary&, ExceptionState&);
 
     static Request* create(ScriptState*, const String&, ExceptionState&);
     static Request* create(ScriptState*, const String&, const Dictionary&, ExceptionState&);
     static Request* create(ScriptState*, Request*, ExceptionState&);
     static Request* create(ScriptState*, Request*, const Dictionary&, ExceptionState&);
     static Request* create(ExecutionContext*, FetchRequestData*);
     static Request* create(ExecutionContext*, const WebServiceWorkerRequest&);
 
-    const FetchRequestData* request() { return m_request; }
-
     // From Request.idl:
     String method() const;
     KURL url() const;
     Headers* headers() const { return m_headers; }
     String context() const;
     String referrer() const;
     String mode() const;
     String credentials() const;
 
     // From Request.idl:
     Request* clone(ExceptionState&);
 
     FetchRequestData* passRequestData();
-
     void populateWebServiceWorkerRequest(WebServiceWorkerRequest&) const;
-
-    bool hasBody() const { return m_request->buffer(); }
+    bool hasBody() const;
+    BodyStreamBuffer* bodyBuffer() override { return m_request->buffer(); }
+    const BodyStreamBuffer* bodyBuffer() const override { return m_request->buffer(); }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     Request(ExecutionContext*, FetchRequestData*);
     Request(ExecutionContext*, const WebServiceWorkerRequest&);
     Request(ExecutionContext*, FetchRequestData*, Headers*);
 
-    void setBuffer(BodyStreamBuffer*);
-    void refreshBody();
-
+    const FetchRequestData* request() const { return m_request; }
     static Request* createRequestWithRequestOrString(ScriptState*, Request*, const String&, const RequestInit&, ExceptionState&);
-    void clearHeaderList();
 
     String mimeType() const override;
 
     const Member<FetchRequestData> m_request;
     const Member<Headers> m_headers;
 };
 
 } // namespace blink
 
 #endif // Request_h