Folding Accessibility Service sample into ApiDemos.

1. Moving Accerssibility Service sample into ApiDemos since
   we are putting all accessibility samples there.

2. Fixed regressions (mainly due to adding new event types)
   in the Accessibility Service sample.

3. Updated the Query Window Content sample to have some
   instructions and to work with touch exploration.

Change-Id: I226ac4130f7f8cae47bb52cbdeab9f104cfaba40

samples/ApiDemos/src/com/example/android/apis/app/ActionBarSettingsActionProviderActivity.java

@@ -19,7 +19,6 @@ package com.example.android.apis.app;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
-import android.os.Bundle;
 import android.provider.Settings;
 import android.view.ActionProvider;
 import android.view.LayoutInflater;
@@ -39,14 +38,6 @@ import com.example.android.apis.R;
  */
 public class ActionBarSettingsActionProviderActivity extends Activity {
 
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-    }
-
     /**
      * {@inheritDoc}
      */