API tweaks round 2

Add nullability annotations and change a static constant to a method
that returns a value.

Fixes: 126702861
Fixes: 126699926
Fixes: 126698717
Fixes: 126699057
Fixes: 126701443
Fixes: 126700882
Test: compiles
Change-Id: I96396eb8890b8b5148cf74447e08c31983398e47

telephony/java/android/telephony/PhoneNumberRange.java

@@ -149,7 +149,7 @@ public final class PhoneNumberRange implements Parcelable {
      * @param number A phone number, with or without separators or a country code.
      * @return {@code true} if the number matches, {@code false} otherwise.
      */
-    public boolean matches(String number) {
+    public boolean matches(@NonNull String number) {
         // Check the prefix, make sure it matches either with or without the country code.
         String normalizedNumber = number.replaceAll("[^0-9]", "");
         String prefixWithCountryCode = mCountryCode + mPrefix;