Fix the binary size regression on Chromium Windows.

webrtc/pc/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")
 if (is_android) {
@@ skipping 167 matching lines @@
     "../api:libjingle_peerconnection_api",
   ]
 }
 
 # This target implements CreatePeerConnectionFactory methods that will create a
 # PeerConnection will full functionality (audio, video and data). Applications
 # that wish to reduce their binary size by ommitting functionality they don't
 # need should use CreateModularCreatePeerConnectionFactory instead, using the
 # "peerconnection" build target and other targets specific to their
 # requrements. See comment in peerconnectionfactoryinterface.h.
-rtc_source_set("create_pc_factory") {
+rtc_static_library("create_pc_factory") {
   sources = [
     "createpeerconnectionfactory.cc",
   ]
 
   deps = [
     "../api:audio_mixer_api",
     "../api:libjingle_peerconnection_api",
     "../api/audio_codecs:audio_codecs_api",
     "../api/audio_codecs:builtin_audio_decoder_factory",
     "../api/audio_codecs:builtin_audio_encoder_factory",
@@ skipping 248 matching lines @@
       "//testing/gmock",
     ]
 
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
 
       shard_timeout = 900
     }
   }
 }