Messaging: Handle default SMS app setting properly

* We don't need two settings basically doing the same
* Handling the change needs to happen via RoleIntent, not
  ACTION_CHANGE_DEFAULT
* Our own name sometimes can't be retrieved from package manager (?) -
  just use it from strings

Change-Id: I28abc52329f00b33a316533f12a54a517cba3514

src/com/android/messaging/ui/conversationlist/AbstractConversationListActivity.java

@@ -16,6 +16,8 @@
  */
 package com.android.messaging.ui.conversationlist;
 
+import static com.android.messaging.util.ChangeDefaultSmsAppHelper.REQUEST_SET_DEFAULT_SMS_APP;
+
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
@@ -58,8 +60,6 @@ import java.util.List;
 public abstract class AbstractConversationListActivity extends BugleActionBarActivity
     implements ConversationListFragmentHost, MultiSelectActionModeCallback.Listener {
 
-    private static final int REQUEST_SET_DEFAULT_SMS_APP = 1;
-
     protected ConversationListFragment mConversationListFragment;
 
     private ChangeDefaultSmsAppHelper mChangeDefaultSmsAppHelper;