Remove OwnPtr from Blink.

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 1179835bec78a3258297af5dfa669e7afcb06a37..608ec91319d03ab766406d36e4afcabe55ce342e 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
+++ b/third_party/WebKit/Source/modules/fetch/FetchDataConsumerHandle.h
@@ -11,6 +11,8 @@
 #include "public/platform/WebDataConsumerHandle.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
+#include "wtf/PtrUtil.h"
+#include <memory>
 
 namespace blink {
 
@@ -64,7 +66,7 @@ public:
     // TODO(yhirano): obtainReader() is currently non-virtual override, and
     // will be changed into virtual override when we can use unique_ptr in
     // Blink.
-    PassOwnPtr<Reader> obtainReader(Client* client) { return adoptPtr(obtainReaderInternal(client)); }
+    std::unique_ptr<Reader> obtainReader(Client* client) { return wrapUnique(obtainReaderInternal(client)); }
 
 private:
     Reader* obtainReaderInternal(Client*) override = 0;