Replace QuicAckListenerInterface* with scoped_refptr<QuicAckListenerInterface>.

net/tools/quic/test_tools/quic_test_client.h

Index: net/tools/quic/test_tools/quic_test_client.h
diff --git a/net/tools/quic/test_tools/quic_test_client.h b/net/tools/quic/test_tools/quic_test_client.h
index d2b9c8d0e65ffc8022a91dc88e5a926b1f7c2566..04cc791bc1e7e9d821d1a8a74f98d97e219df2dd 100644
--- a/net/tools/quic/test_tools/quic_test_client.h
+++ b/net/tools/quic/test_tools/quic_test_client.h
@@ -115,7 +115,7 @@ class QuicTestClient : public QuicSpdyStream::Visitor,
   // As above, but |delegate| will be notified when |data| is ACKed.
   ssize_t SendData(const std::string& data,
                    bool last_data,
-                   QuicAckListenerInterface* delegate);
+                   const scoped_refptr<QuicAckListenerInterface>& delegate);
 
   // Clears any outstanding state and sends a simple GET of 'uri' to the
   // server.  Returns 0 if the request failed and no bytes were written.
@@ -215,10 +215,11 @@ class QuicTestClient : public QuicSpdyStream::Visitor,
   // Calls GetOrCreateStream(), sends the request on the stream, and
   // stores the request in case it needs to be resent.  If |headers| is
   // null, only the body will be sent on the stream.
-  ssize_t GetOrCreateStreamAndSendRequest(const SpdyHeaderBlock* headers,
-                                          base::StringPiece body,
-                                          bool fin,
-                                          QuicAckListenerInterface* delegate);
+  ssize_t GetOrCreateStreamAndSendRequest(
+      const SpdyHeaderBlock* headers,
+      base::StringPiece body,
+      bool fin,
+      const scoped_refptr<QuicAckListenerInterface>& delegate);
 
   QuicRstStreamErrorCode stream_error() { return stream_error_; }
   QuicErrorCode connection_error();
@@ -275,22 +276,20 @@ class QuicTestClient : public QuicSpdyStream::Visitor,
  private:
   class TestClientDataToResend : public QuicClient::QuicDataToResend {
    public:
-    TestClientDataToResend(std::unique_ptr<SpdyHeaderBlock> headers,
-                           base::StringPiece body,
-                           bool fin,
-                           QuicTestClient* test_client,
-                           QuicAckListenerInterface* delegate)
-        : QuicClient::QuicDataToResend(std::move(headers), body, fin),
-          test_client_(test_client),
-          delegate_(delegate) {}
+    TestClientDataToResend(
+        std::unique_ptr<SpdyHeaderBlock> headers,
+        base::StringPiece body,
+        bool fin,
+        QuicTestClient* test_client,
+        const scoped_refptr<QuicAckListenerInterface>& delegate);
 
-    ~TestClientDataToResend() override {}
+    ~TestClientDataToResend() override;
 
     void Resend() override;
 
    protected:
     QuicTestClient* test_client_;
-    QuicAckListenerInterface* delegate_;
+    scoped_refptr<QuicAckListenerInterface> delegate_;
   };
 
   // Given |uri|, populates the fields in |headers| for a simple GET