Enable ASan default options on Mac.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index e51e310569dd2e911ca0a0ae7fb6b70aa02dd75e..8fbd78c5b99acddeced6b58f66e1fb62f6e439ac 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -389,7 +389,7 @@
 
       # Enable Chromium overrides of the default configurations for various
       # dynamic tools (like ASan).
-      'use_sanitizer_options%': 1,
+      'use_sanitizer_options%': 0,
 
       # Enable building with SyzyAsan.
       # See https://code.google.com/p/sawbuck/wiki/SyzyASanHowTo
@@ -2145,6 +2145,7 @@
       ['asan==1 or msan==1 or lsan==1 or tsan==1', {
         'clang%': 1,
         'use_allocator%': 'none',
+        'use_sanitizer_options%': 1,
       }],
       ['asan==1 and OS=="linux" and chromeos==0', {
         'use_custom_libcxx%': 1,
@@ -3484,6 +3485,14 @@
           '-Wl,-z,now',
           '-Wl,-z,relro',
         ],
+        # TODO(glider): enable the default options on other systems.
+        'conditions': [
+          ['use_sanitizer_options==1 and ((OS=="linux" and (chromeos==0 or target_arch!="ia32")) or OS=="mac")', {
+            'dependencies': [
+              '<(DEPTH)/build/sanitizers/sanitizers.gyp:sanitizer_options',
+            ],
+          }],
+        ],
       },
     }],
     # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580
@@ -4099,14 +4108,6 @@
                 ],
               }],
             ],
-            # TODO(glider): enable the default options on other systems.
-            'conditions': [
-              ['use_sanitizer_options==1 and OS=="linux" and (chromeos==0 or target_arch!="ia32")', {
-                'dependencies': [
-                  '<(DEPTH)/build/sanitizers/sanitizers.gyp:sanitizer_options',
-                ],
-              }],
-            ],
           }],
           ['asan==1', {
             'target_conditions': [