Fix AppRTC Android Demo GN build when is_component_build=true.

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")
 import("//testing/test.gni")
@@ skipping 206 matching lines @@
     sources = [
       "android/jni/jni_onload.cc",
     ]
 
     configs -= [ "//build/config/android:hide_native_jni_exports" ]
 
     deps = [
       ":libjingle_peerconnection",
       ":libjingle_peerconnection_jni",
     ]
+    output_extension = "so"
   }
 
   android_library("libjingle_peerconnection_java") {
     java_files = [
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/BuildInfo.java",
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioEffects.java",
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java",
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioRecord.java",
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java",
       "../modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java",
@@ skipping 198 matching lines @@
 
       shared_libraries = [ ":libjingle_peerconnection_so" ]
     }
 
     android_resources("libjingle_peerconnection_android_unittest_resources") {
       resource_dirs = [ "androidtests/res" ]
       custom_package = "org.webrtc"
     }
   }
 }