Change Linkify leniency to VALID

The linkify logic used POSSIBLE as its leniency setting, which resulted
in false positives such as 4-digit years being interpreted as phone
numbers. Changing to VALID as per recommendation of libphonenumber
people, which fixes this problem.

Bug: 18489494
Change-Id: I77d330285de46de2fdda22daed41392106ec6ddd

core/java/android/text/util/Linkify.java

@@ -402,7 +402,7 @@ public class Linkify {
         }
 
         boolean hasPrefix = false;
-        
+
         for (int i = 0; i < prefixes.length; i++) {
             if (url.regionMatches(true, 0, prefixes[i], 0,
                                   prefixes[i].length())) {
@@ -450,7 +450,7 @@ public class Linkify {
     private static final void gatherTelLinks(ArrayList<LinkSpec> links, Spannable s) {
         PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
         Iterable<PhoneNumberMatch> matches = phoneUtil.findNumbers(s.toString(),
-                Locale.getDefault().getCountry(), Leniency.POSSIBLE, Long.MAX_VALUE);
+                Locale.getDefault().getCountry(), Leniency.VALID, Long.MAX_VALUE);
         for (PhoneNumberMatch match : matches) {
             LinkSpec spec = new LinkSpec();
             spec.url = "tel:" + PhoneNumberUtils.normalizeNumber(match.rawString());