Fix some sign-compare warnings in webrtc/api.

webrtc/api/api.gyp

 # 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 180 matching lines @@
         'videotrack.h',
         'videotracksource.cc',
         'videotracksource.h',
         'webrtcsdp.cc',
         'webrtcsdp.h',
         'webrtcsession.cc',
         'webrtcsession.h',
         'webrtcsessiondescriptionfactory.cc',
         'webrtcsessiondescriptionfactory.h',
       ],
-      # TODO(kjellander): Make the code compile without disabling these flags.
-      # See https://bugs.chromium.org/p/webrtc/issues/detail?id=3307
-      'cflags': [
-        '-Wno-sign-compare',
-      ],
       'conditions': [
         ['clang==1', {
           'cflags!': [
             '-Wextra',
           ],
           'xcode_settings': {
             'WARNING_CFLAGS!': ['-Wextra'],
           },
         }, {
           'cflags': [
             '-Wno-maybe-uninitialized',  # Only exists for GCC.
           ],
         }],
-        ['OS=="win"', {
-          # Disable warning for signed/unsigned mismatch.
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'AdditionalOptions!': ['/we4389'],
-            },
-          },
-        }],
-        ['OS=="win" and clang==1', {
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'AdditionalOptions': [
-                '-Wno-sign-compare',
-              ],
-            },
-          },
-        }],
         ['use_quic==1', {
           'dependencies': [
             '<(DEPTH)/third_party/libquic/libquic.gyp:libquic',
           ],
           'sources': [
             'quicdatachannel.cc',
             'quicdatachannel.h',
             'quicdatatransport.cc',
             'quicdatatransport.h',
           ],
           'export_dependent_settings': [
             '<(DEPTH)/third_party/libquic/libquic.gyp:libquic',
           ],
         }],
       ],
     },  # target libjingle_peerconnection
   ],  # targets
 }