Fix chromium-style warnings.

webrtc/modules/rtp_rtcp/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../../build/webrtc.gni")
 
@@ skipping 115 matching lines @@
     "source/rtp_payload_registry.cc",
     "source/rtp_receiver_audio.cc",
     "source/rtp_receiver_audio.h",
     "source/rtp_receiver_impl.cc",
     "source/rtp_receiver_impl.h",
     "source/rtp_receiver_strategy.cc",
     "source/rtp_receiver_strategy.h",
     "source/rtp_receiver_video.cc",
     "source/rtp_receiver_video.h",
     "source/rtp_rtcp_config.h",
+    "source/rtp_rtcp_defines_nullimpl.cc",

[danilchap, 2016/10/07 12:42:49]

may be call this files
null_rtp_callbacks

[terelius, 2016/10/07 15:03:37]

My reasoning for choosing this name is that the file essentially contains the
null implementations of the interfaces declared in rtcp_defines.h. Since there
are other null objects/callbacks in the RTP module, I prefer a name that
clarifies which objects live in the file. Or do you think we will want to move
in other objects into this file?

[danilchap, 2016/10/07 17:22:00]

might make sense to move the remaining object into that file too eventually.
(found just one another: NullReceiveStatistics).

for now might better to leave rtp_rtcp_defines_nullimpl to simplify lookup

+    "source/rtp_rtcp_defines_nullimpl.h",
     "source/rtp_rtcp_impl.cc",
     "source/rtp_rtcp_impl.h",
     "source/rtp_sender.cc",
     "source/rtp_sender.h",
     "source/rtp_sender_audio.cc",
     "source/rtp_sender_audio.h",
     "source/rtp_sender_video.cc",
     "source/rtp_sender_video.h",
     "source/rtp_utility.cc",
     "source/rtp_utility.h",
@@ skipping 49 matching lines @@
       "test/testFec/test_packet_masks_metrics.cc",
     ]
 
     deps = [
       ":rtp_rtcp",
       "//testing/gtest",
       "//webrtc/test:test_support_main",
     ]
   }  # test_packet_masks_metrics
 }