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

webrtc/api/peerconnectioninterface_unittest.cc

Index: webrtc/api/peerconnectioninterface_unittest.cc
diff --git a/webrtc/api/peerconnectioninterface_unittest.cc b/webrtc/api/peerconnectioninterface_unittest.cc
index 0b24fcb7cfc4d119af78dacd4258d84f6188aa76..85b3649a2df521172ce4769e7d8abcbfae8aa8d3 100644
--- a/webrtc/api/peerconnectioninterface_unittest.cc
+++ b/webrtc/api/peerconnectioninterface_unittest.cc
@@ -1827,12 +1827,12 @@ TEST_F(PeerConnectionInterfaceTest,
   channel = pc_->CreateDataChannel("x", &config);
   EXPECT_TRUE(channel == NULL);
 
-  config.id = cricket::kMaxSctpSid;
+  config.id = cricket::kMaxSctpStreams - 1;
   channel = pc_->CreateDataChannel("max", &config);
   EXPECT_TRUE(channel != NULL);
   EXPECT_EQ(config.id, channel->id());
 
-  config.id = cricket::kMaxSctpSid + 1;
+  config.id = cricket::kMaxSctpStreams;
   channel = pc_->CreateDataChannel("x", &config);
   EXPECT_TRUE(channel == NULL);
 }