Whitelist search by image string for iOS.

Review URL: https://chromiumcodereview.appspot.com/22415005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@216483 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

ios/grit_whitelist.txt

@@ -204,6 +204,7 @@ IDS_CERT_ERROR_WEAK_SIGNATURE_ALGORITHM_EXTRA_INFO_2
 IDS_CERT_ERROR_WEAK_SIGNATURE_ALGORITHM_TITLE
 IDS_CHROME_TO_DEVICE_PRINT_TO_PHONE
 IDS_CHROME_TO_DEVICE_SNAPSHOTS
+IDS_CONTENT_CONTEXT_SEARCHWEBFORIMAGE
 IDS_COPY_URL_MAC
 IDS_COULDNT_OPEN_PROFILE_ERROR
 IDS_CRASHES_BUG_LINK_LABEL