Fixing off-by-one error with max SCTP id.

webrtc/media/sctp/sctpdataengine_unittest.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 472 matching lines @@
   SetupConnectedChannels();
   EXPECT_TRUE_WAIT(channel1()->socket() != NULL, 1000);
   struct socket *sock = const_cast<struct socket*>(channel1()->socket());
   int prior_count = channel1_ready_to_send_count();
   SctpDataMediaChannel::SendThresholdCallback(sock, 0);
   EXPECT_GT(channel1_ready_to_send_count(), prior_count);
 }
 
 TEST_F(SctpDataMediaChannelTest, RefusesHighNumberedChannels) {
   SetupConnectedChannels();
-  EXPECT_TRUE(AddStream(1022));
-  EXPECT_FALSE(AddStream(1023));
+  EXPECT_TRUE(AddStream(kMaxSctpStreams - 1));
+  EXPECT_FALSE(AddStream(kMaxSctpStreams));
 }
 
 // Flaky, see webrtc:4453.
 TEST_F(SctpDataMediaChannelTest, DISABLED_ReusesAStream) {
   // Shut down channel 1, then open it up again for reuse.
   SetupConnectedChannels();
   SendDataResult result;
   SignalChannelClosedObserver chan_2_sig_receiver;
   chan_2_sig_receiver.BindSelf(channel2());
 
   ASSERT_TRUE(SendData(channel1(), 1, "hello?", &result));
   EXPECT_EQ(SDR_SUCCESS, result);
   EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hello?"), 1000);
 
   channel1()->RemoveSendStream(1);
   EXPECT_TRUE_WAIT(chan_2_sig_receiver.WasStreamClosed(1), 1000);
   // Channel 1 is gone now.
 
   // Create a new channel 1.
   AddStream(1);
   ASSERT_TRUE(SendData(channel1(), 1, "hi?", &result));
   EXPECT_EQ(SDR_SUCCESS, result);
   EXPECT_TRUE_WAIT(ReceivedData(receiver2(), 1, "hi?"), 1000);
   channel1()->RemoveSendStream(1);
   EXPECT_TRUE_WAIT(chan_2_sig_receiver.StreamCloseCount(1) == 2, 1000);
 }
 
 }  // namespace cricket