[DO NOT MERGE] Fix can't change notification sound for work profile. am: edf4416177

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/18704664

Change-Id: I97954b12a7385a4cd5caabb19c030744ae6895f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

src/com/android/settings/DefaultRingtonePreference.java

@@ -51,7 +51,7 @@ public class DefaultRingtonePreference extends RingtonePreference {
             return;
         }
 
-        String mimeType = getContext().getContentResolver().getType(ringtoneUri);
+        String mimeType = mUserContext.getContentResolver().getType(ringtoneUri);
         if (mimeType == null) {
             Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
                     + " ignored: failure to find mimeType (no access from this context?)");

tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java

@@ -59,6 +59,7 @@ public class DefaultRingtonePreferenceTest {
         when(mDefaultRingtonePreference.getRingtoneType())
                 .thenReturn(RingtoneManager.TYPE_RINGTONE);
         mDefaultRingtonePreference.setUserId(1);
+        mDefaultRingtonePreference.mUserContext = context;
     }
 
     @Test