Stop using InputMethodUtils.isValidSystemDefaultIme

This is a follow up CL for a recent attempt to minimize
the number of default enabled IMEs.
- part1: I831502db502f4073c9c2f50ce7705a4e45e2e1e3
- part2: Ife93d909fb8a24471c425c903e2b7048826e17a3
- part3: I6571d464a46453934f0a8f5e79018a67a9a3c845
- part4: I871ccda787eb0f1099ba3574356c1da4b33681f3

In the above changes,
InputMethodUtils.isValidSystemDefaultIme was deprecated in favor
of InputMethodUtils.isSystemImeThatHasSubtypeOf.

With this CL, InputMethodUtils.isValidSystemDefaultIme is not
used by the setting app anymore and we can remove that method
from InputMethodUtils finally.

This is a pure code refactoring with preserving the current
logic. Hence no behavior change is intended.

Change-Id: Ie96b0d17745735db63eebe6fe1654f32d9b9a170

src/com/android/settings/inputmethod/InputMethodSettingValuesWrapper.java

@@ -186,13 +186,16 @@ class InputMethodSettingValuesWrapper {
         if (imi.isAuxiliaryIme()) {
             return false;
         }
-        if (InputMethodUtils.isValidSystemDefaultIme(true /* isSystemReady */, imi, context)) {
+        final Locale systemLocale = context.getResources().getConfiguration().locale;
+        if (InputMethodUtils.isSystemImeThatHasSubtypeOf(imi, context,
+                    true /* checkDefaultAttribute */, systemLocale, false /* checkCountry */,
+                    InputMethodUtils.SUBTYPE_MODE_ANY)) {
             return true;
         }
         if (mAsciiCapableEnabledImis.isEmpty()) {
             Log.w(TAG, "ascii capable subtype enabled imi not found. Fall back to English"
                     + " Keyboard subtype.");
-            return InputMethodUtils.containsSubtypeOf(imi, Locale.ENGLISH.getLanguage(),
+            return InputMethodUtils.containsSubtypeOf(imi, Locale.ENGLISH, false /* checkCountry */,
                     InputMethodUtils.SUBTYPE_MODE_KEYBOARD);
         }
         return mAsciiCapableEnabledImis.contains(imi);