Add Print string for iOS

BUG=NONE


Review URL: https://chromiumcodereview.appspot.com/11348194

git-svn-id: http://src.chromium.org/svn/trunk/src/build@169264 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

ios/grit_whitelist.txt

@@ -381,6 +381,7 @@ IDS_PAST_TIME_TODAY
 IDS_PAST_TIME_YESTERDAY
 IDS_PREFERENCES_CORRUPT_ERROR
 IDS_PREFERENCES_UNREADABLE_ERROR
+IDS_PRINT
 IDS_PRIVACY_POLICY_URL
 IDS_PRODUCT_NAME
 IDS_PROFILES_LOCAL_PROFILE_STATE