WebRTC: Remove redundant GYP_DEFINES on iOS bots.

scripts/slave/recipe_modules/webrtc/chromium_config.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from recipe_engine.config import BadConf
 from recipe_engine.config_types import Path
 
 import DEPS
 CONFIG_CTX = DEPS['chromium'].CONFIG_CTX
 
@@ skipping 25 matching lines @@
                   c.HOST_PLATFORM)  # pragma: no cover
   if c.TARGET_PLATFORM != 'ios':
     raise BadConf('Only "ios" target platform is supported (got: "%s")' %
                   c.TARGET_PLATFORM)  # pragma: no cover
   if c.TARGET_ARCH == 'arm':
     c.build_config_fs = c.BUILD_CONFIG + '-iphoneos'
   if c.TARGET_ARCH == 'intel':
     c.build_config_fs = c.BUILD_CONFIG + '-iphonesimulator'
 
   gyp_defs = c.gyp_env.GYP_DEFINES
-  gyp_defs['build_with_libjingle'] = 1
   gyp_defs['chromium_ios_signing'] = 0
-  gyp_defs['key_id'] = ''
   gyp_defs['OS'] = c.TARGET_PLATFORM
   _compiler_defaults(c)
 
 @CONFIG_CTX(includes=['gn'])
 def webrtc_gn(c):
   c.compile_py.default_targets = ['all']
 
 def _compiler_defaults(c):
   c.compile_py.default_targets = ['All']
   if c.TARGET_PLATFORM in ('mac', 'ios'):
     c.gyp_env.GYP_DEFINES['mac_sdk'] = '10.9'