enable -Wstring-conversion when compiling with clang

third_party/libjingle/libjingle.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     '../../build/win_precompile.gypi',
   ],
   'variables': {
     'enabled_libjingle_device_manager%': 0,
@@ skipping 162 matching lines @@
           '../third_party/platformsdk_win7/files/Include',
         ],
         'conditions' : [
           ['target_arch == "ia32"', {
             'defines': [
               '_USE_32BIT_TIME_T',
             ],
           }],
         ],
       }],
+      ['clang == 1', {
+        'xcode_settings': {
+          'WARNING_CFLAGS!': [
+            # Don't warn about string->bool used in asserts.
+            '-Wstring-conversion',
+          ],
+        },
+        'cflags!': [
+          '-Wstring-conversion',
+        ],
+      }],
       ['OS=="linux"', {
         'defines': [
           'LINUX',
         ],
       }],
       ['OS=="mac"', {
         'defines': [
           'OSX',
         ],
       }],
@@ skipping 620 matching lines @@
             '<(DEPTH)/third_party/webrtc/system_wrappers/source/system_wrappers.gyp:system_wrappers',
             '<@(libjingle_peerconnection_additional_deps)',
             'libjingle',
             'libjingle_p2p',
           ],
         },  # target libjingle_peerconnection
       ],
     }],
   ],
 }