Convert libexif.gyp to new clang flags after r287092.

third_party/libexif/libexif.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.
 
 {
   'variables': {
     'conditions': [
       ['OS == "linux" and chromeos==0', {
         'use_system_libexif%': 1,
       }, {  # OS != "linux" and chromeos==0
@@ skipping 34 matching lines @@
             'sources/libexif/pentax/mnote-pentax-tag.c',
           ],
           'include_dirs': [
             'sources',
           ],
           'direct_dependent_settings': {
             'include_dirs': [
               'sources',
             ],
           },
+          'variables': {
+            'clang_warning_flags': [
+              '-Wno-enum-conversion',
+              '-Wno-switch',
+              '-Wno-format',
+              # libexif uses fabs(int) to cast to float.
+              '-Wno-absolute-value',
+            ],
+          },
           'conditions': [
-            ['clang==1', {
-              'cflags': [
-                '-Wno-enum-conversion', 
-                '-Wno-switch',
-                # libexif uses fabs(int) to cast to float.
-                '-Wno-absolute-value',
-              ],
-              'xcode_settings': {
-                'WARNING_CFLAGS': [
-                  '-Wno-enum-conversion', 
-                  '-Wno-switch',
-                  '-Wno-format',
-                  # libexif uses fabs(int) to cast to float.
-                  '-Wno-absolute-value',
-                ],
-              },
-            }],
             ['os_posix==1 and OS!="mac"', {
               'cflags!': ['-fvisibility=hidden'],
             }],
             ['OS=="mac"', {
               'conditions': [
                ['mac_breakpad==1', {
                   'variables': {
                     'mac_real_dsym': 1,
                   },
                }],
@@ skipping 42 matching lines @@
             ],
             'defines': [
               'USE_SYSTEM_LIBEXIF',
             ],
           },
         }
       ],
     }],
   ]
 }