Build WebRTC with data channel only.

webrtc/modules/BUILD.gn

 # Copyright (c) 2016 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("../webrtc.gni")
 import("audio_coding/audio_coding.gni")
@@ skipping 45 matching lines @@
       outputs = [
         "{{bundle_resources_dir}}/{{source_file_part}}",
       ]
     }
   }
 
   rtc_test("modules_tests") {
     testonly = true
 
     deps = [
+      "../pc:create_pc_factory",
       "../test:test_main",
       "../test:video_test_common",
       "audio_coding:audio_coding_modules_tests",
       "desktop_capture:desktop_capture_modules_tests",
       "rtp_rtcp:rtp_rtcp_modules_tests",
       "video_coding:video_coding_modules_tests",
       "//testing/gmock",
       "//testing/gtest",
     ]
 
@@ skipping 175 matching lines @@
       shard_timeout = 900
     }
     if (is_ios) {
       info_plist = "//webrtc/test/ios/Info.plist"
       deps += [ ":modules_unittests_bundle_data" ]
       configs += [ "..:common_objc" ]
       ldflags = [ "-ObjC" ]
     }
   }
 }