[Fetch API] Remove DrainingBuffer.

Source/modules/fetch/Response.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 Response_h
 #define Response_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/BodyStreamBuffer.h"
 #include "modules/fetch/FetchResponseData.h"
 #include "modules/fetch/Headers.h"
 #include "platform/blob/BlobData.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Blob;
-class DrainingBodyStreamBuffer;
 class DOMArrayBuffer;
 class ExceptionState;
 class ResponseInit;
 class WebServiceWorkerResponse;
 
 typedef BlobOrArrayBufferOrArrayBufferViewOrFormDataOrUSVString BodyInit;
 
-class MODULES_EXPORT Response final : public Body, public BodyStreamBuffer::DrainingStreamNotificationClient {
+class MODULES_EXPORT Response final : public Body {
     DEFINE_WRAPPERTYPEINFO();
-    USING_GARBAGE_COLLECTED_MIXIN(Response);
+    WTF_MAKE_NONCOPYABLE(Response);
 public:
     ~Response() override { }
 
     // From Response.idl:
     static Response* create(ExecutionContext*, ExceptionState&);
     static Response* create(ExecutionContext*, const BodyInit&, const Dictionary&, ExceptionState&);
 
     static Response* create(ExecutionContext*, Blob*, const ResponseInit&, ExceptionState&);
     static Response* create(ExecutionContext*, FetchResponseData*);
     static Response* create(ExecutionContext*, const WebServiceWorkerResponse&);
@@ skipping 16 matching lines @@
     // From Response.idl:
     Response* clone(ExceptionState&);
 
     // ActiveDOMObject
     bool hasPendingActivity() const override;
 
     // Does not call response.setBlobDataHandle().
     void populateWebServiceWorkerResponse(WebServiceWorkerResponse& /* response */);
 
     bool hasBody() const;
+    BodyStreamBuffer* bodyBuffer() override { return m_response->buffer(); }
+    const BodyStreamBuffer* bodyBuffer() const override { return m_response->buffer(); }
+    BodyStreamBuffer* internalBodyBuffer() { return m_response->internalBuffer(); }
+    const BodyStreamBuffer* internalBodyBuffer() const { return m_response->internalBuffer(); }
 
     String mimeType() const override;
     String internalMIMEType() const;
 
-    // Do not call leakBuffer() on the returned buffer because
-    // hasPendingActivity() assumes didFetchDataLoadFinishedFromDrainingStream()
-    // will be called.
-    PassOwnPtr<DrainingBodyStreamBuffer> createInternalDrainingStream();
-    void didFetchDataLoadFinishedFromDrainingStream() override;
-
-    // Only for tests (null checks and identity checks).
-    void* bufferForTest() const;
-    void* internalBufferForTest() const;
-
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit Response(ExecutionContext*);
     Response(ExecutionContext*, FetchResponseData*);
     Response(ExecutionContext*, FetchResponseData*, Headers*);
 
-    void refreshBody();
-
     const Member<FetchResponseData> m_response;
     const Member<Headers> m_headers;
-    bool m_isInternalDrained;
 };
 
 } // namespace blink
 
 #endif // Response_h