Return unique_ptr<WebDataConsumerHandle::Reader> directly from obtainReader

third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h

Index: third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
diff --git a/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h b/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
index 608ec91319d03ab766406d36e4afcabe55ce342e..547c06e4c1070e0f239e5075a32733b8f1322734 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
+++ b/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
@@ -63,13 +63,8 @@ public:
         virtual PassRefPtr<EncodedFormData> drainAsFormData() { return nullptr; }
     };
 
-    // TODO(yhirano): obtainReader() is currently non-virtual override, and
-    // will be changed into virtual override when we can use unique_ptr in
-    // Blink.
-    std::unique_ptr<Reader> obtainReader(Client* client) { return wrapUnique(obtainReaderInternal(client)); }
-
-private:
-    Reader* obtainReaderInternal(Client*) override = 0;
+    std::unique_ptr<WebDataConsumerHandle::Reader> obtainReader(Client*) final;
+    virtual std::unique_ptr<Reader> obtainFetchDataReader(Client*) = 0;
 };
 
 } // namespace blink