fix enable_web_intents default values

BUG=173194

Review URL: https://codereview.chromium.org/12184028

git-svn-id: http://src.chromium.org/svn/trunk/src/build@180561 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -157,9 +157,9 @@
 
           ['OS!="android" and OS!="ios"', {
             # Enable Web Intents support in WebKit.
-            'enable_web_intents%': '1',
+            'enable_web_intents%': 1,
           }, {
-            'enable_web_intents%': '0',
+            'enable_web_intents%': 0,
           }],
         ],
       },