Remove all references to GYP

webrtc/api/BUILD.gn

 # Copyright (c) 2015 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")
 if (is_android) {
@@ skipping 300 matching lines @@
       "android/java/src/org/webrtc/VideoTrack.java",
       "android/java/src/org/webrtc/YuvConverter.java",
     ]
 
     deps = [
       "../base:base_java",
     ]
   }
 }
 
-# GYP version: webrtc/api/api.gyp:rtc_stats_api
 rtc_source_set("rtc_stats_api") {
   cflags = []
   sources = [
     "stats/rtcstats.h",
     "stats/rtcstats_objects.h",
     "stats/rtcstatsreport.h",
   ]
 
   deps = [
     "../base:rtc_base_approved",
   ]
 }
 
-# GYP version: webrtc/api/api.gyp:audio_mixer_api
 rtc_source_set("audio_mixer_api") {
   sources = [
     "audio/audio_mixer.h",
   ]
 
   deps = [
     "../base:rtc_base_approved",
   ]
 }
 
@@ skipping 142 matching lines @@
       deps = [
         ":libjingle_peerconnection_java",
         "../base:base_java",
         "//base:base_java",
       ]
 
       shared_libraries = [ ":libjingle_peerconnection_so" ]
     }
   }
 }