Merge changes from topics "presubmit-am-7e93fea7eeca4c76a2b33d5fe115ad40", "presubmit-am-93b3a992dd6c4622a633bca394ada8e5-sc-dev" into sc-dev

* changes:
  [DO NOT MERGE] Fix can't change notification sound for work profile.
  [DO NOT MERGE] Fix Settings crash when setting a null ringtone
diff --git a/src/com/android/settings/DefaultRingtonePreference.java b/src/com/android/settings/DefaultRingtonePreference.java
index 914c4b2..9bf626c 100644
--- a/src/com/android/settings/DefaultRingtonePreference.java
+++ b/src/com/android/settings/DefaultRingtonePreference.java
@@ -46,7 +46,12 @@
 
     @Override
     protected void onSaveRingtone(Uri ringtoneUri) {
-        String mimeType = getContext().getContentResolver().getType(ringtoneUri);
+        if (ringtoneUri == null) {
+            setActualDefaultRingtoneUri(ringtoneUri);
+            return;
+        }
+
+        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?)");
diff --git a/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java b/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
index b9dea01..7877684 100644
--- a/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
+++ b/tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java
@@ -59,6 +59,7 @@
         when(mDefaultRingtonePreference.getRingtoneType())
                 .thenReturn(RingtoneManager.TYPE_RINGTONE);
         mDefaultRingtonePreference.setUserId(1);
+        mDefaultRingtonePreference.mUserContext = context;
     }
 
     @Test