Don't write spaces after semicolons in FMTP lines.

webrtc/api/webrtcsdp_unittest.cc

 /*
  *  Copyright 2011 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 2096 matching lines @@
   // TODO(hta): Check if payload type |pt| occurs in the m=video line.
   std::string to_find = "a=fmtp:" + pt + " ";
   size_t fmtp_pos = message.find(to_find);
   ASSERT_NE(std::string::npos, fmtp_pos) << "Failed to find " << to_find;
   size_t fmtp_endpos = message.find("\n", fmtp_pos);
   ASSERT_NE(std::string::npos, fmtp_endpos);
   std::string fmtp_value = message.substr(fmtp_pos, fmtp_endpos);
   EXPECT_NE(std::string::npos, fmtp_value.find("level-asymmetry-allowed=1"));
   EXPECT_NE(std::string::npos, fmtp_value.find("packetization-mode=1"));
   EXPECT_NE(std::string::npos, fmtp_value.find("profile-level-id=42e01f"));
+  // Check that there are no spaces after semicolons.
+  // https://bugs.webrtc.org/5793
+  EXPECT_EQ(std::string::npos, fmtp_value.find("; "));
 }
 
 TEST_F(WebRtcSdpTest, DeserializeSessionDescription) {
   JsepSessionDescription jdesc(kDummyString);
   // Deserialize
   EXPECT_TRUE(SdpDeserialize(kSdpFullString, &jdesc));
   // Verify
   EXPECT_TRUE(CompareSessionDescription(jdesc_, jdesc));
 }
 
@@ skipping 1014 matching lines @@
   EXPECT_TRUE(
       SdpDeserialize(kUnifiedPlanSdpFullString, &deserialized_description));
 
   EXPECT_TRUE(CompareSessionDescription(jdesc_, deserialized_description));
 }
 
 TEST_F(WebRtcSdpTest, SerializeUnifiedPlanSessionDescription) {
   MakeUnifiedPlanDescription();
   TestSerialize(jdesc_, true);
 }