Revert "Messaging: Add "Mark as read" quick action for message notifications"

This reverts commit f19e916a0d.

Reason for revert: Reverting per Taesu Lee's comments, because it doesn't work and has issues.

Change-Id: I778362b628f4c3ae076dd943e77dee415984fba0

src/com/android/messaging/ui/UIIntents.java

@@ -69,9 +69,6 @@ public abstract class UIIntents {
     public static final String ACTION_RESET_NOTIFICATIONS =
             "com.android.messaging.reset_notifications";
 
-    public static final String ACTION_MARK_AS_READ =
-            "com.android.messaging.mark_as_read";
-
     // Sending VCard uri to VCard detail activity
     public static final String UI_INTENT_EXTRA_VCARD_URI = "vcard_uri";
 
@@ -336,14 +333,6 @@ public abstract class UIIntents {
             final int updateTargets, final ConversationIdSet conversationIdSet,
             final int requestCode);
 
-    /**
-     * Get a PendingIntent for marking a conversation as read.
-     *
-     * <p>This is intended to be used by notifications.
-     */
-    public abstract PendingIntent getPendingIntentForMarkingAsRead(final Context context,
-            final ConversationIdSet conversationIdSet, final int requestCode);
-
     /**
      * Get a PendingIntent for showing low storage notifications.
      */