Fix flaky test in QuicSessionTest. Port of

net/quic/quic_session_test.cc

 // Copyright (c) 2012 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.
 
 #include "net/quic/quic_session.h"
 
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 721 matching lines @@
   SpdyHeaderBlock headers;
   while (!headers_stream->flow_controller()->IsBlocked() && stream_id < 2000) {
     EXPECT_FALSE(session_.IsConnectionFlowControlBlocked());
     EXPECT_FALSE(session_.IsStreamFlowControlBlocked());
     headers["header"] = base::Uint64ToString(base::RandUint64()) +
         base::Uint64ToString(base::RandUint64()) +
         base::Uint64ToString(base::RandUint64());
     headers_stream->WriteHeaders(stream_id, headers, true, nullptr);
     stream_id += 2;
   }
-  // Write one more to ensure that the headers stream has buffered data. The
+  // Write once more to ensure that the headers stream has buffered data. The
   // random headers may have exactly filled the flow control window.
   headers_stream->WriteHeaders(stream_id, headers, true, nullptr);
   EXPECT_TRUE(headers_stream->HasBufferedData());
 
   EXPECT_TRUE(headers_stream->flow_controller()->IsBlocked());
   EXPECT_FALSE(crypto_stream->flow_controller()->IsBlocked());
   EXPECT_FALSE(session_.IsConnectionFlowControlBlocked());
   EXPECT_TRUE(session_.IsStreamFlowControlBlocked());
   EXPECT_FALSE(session_.HasDataToWrite());
 
@@ skipping 268 matching lines @@
   }
 
   // Called after any new data is received by the session, and triggers the call
   // to close the connection.
   session_.PostProcessAfterData();
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net