Harmonize WebRTC gyp and gn flags.

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 122 matching lines @@
 # Exclude the targets below from the Chromium build since they cannot be built
 # due to incompability with Chromium's logging implementation.
 if (is_android && !build_with_chromium) {
   config("libjingle_peerconnection_jni_warnings_config") {
     # The warnings below are enabled by default. Since GN orders compiler flags
     # for a target before flags from configs, the only way to disable such
     # warnings is by having them in a separate config, loaded from the target.
     if (!is_win) {
       cflags = [
         "-Wno-sign-compare",
-        "-Wno-unused-variable",
       ]
     }
   }
 
   source_set("libjingle_peerconnection_jni") {
     sources = [
       "android/jni/androidmediacodeccommon.h",
       "android/jni/androidmediadecoder_jni.cc",
       "android/jni/androidmediadecoder_jni.h",
       "android/jni/androidmediaencoder_jni.cc",
@@ skipping 237 matching lines @@
       "../pc:rtc_pc",
       "../system_wrappers:metrics_default",
       "//testing/gmock",
     ]
 
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
     }
   }
 }