Added coverage support for all iOS targets.

build/ios/coverage.gypi

 # Copyright 2014 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': {
-    'chromium_code': 1,
     'enable_coverage%': 0,
   },
   'conditions': [
-    ['OS=="ios" and enable_coverage', {
+    ['enable_coverage', {
         'target_defaults': {
           'defines': [
             'ENABLE_TEST_CODE_COVERAGE=1'
           ],
           'link_settings': {
             'xcode_settings': {
               'OTHER_LDFLAGS': [
                 '-fprofile-arcs',
               ],
             },
           },
           'xcode_settings': {
             'OTHER_CFLAGS': [
               '-fprofile-arcs',
               '-ftest-coverage',
             ],
           },
         },
     }],
   ],
 }