Move Java Blimp shell code to app subpackage

blimp/client/app/android/java/src/org/chromium/blimp/app/BrowserRestartActivity.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package org.chromium.blimp;
+package org.chromium.blimp.app;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Process;
 
 /**
  * Kills and (optionally) restarts the main Blimp process, then immediately kills itself.
  *
@@ skipping 49 matching lines @@
      */
     public static Intent createRestartIntent(Context context) {
         Intent intent = new Intent();
         intent.setClassName(context.getPackageName(), BrowserRestartActivity.class.getName());
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.putExtra(BrowserRestartActivity.EXTRA_MAIN_PID, Process.myPid());
         intent.putExtra(BrowserRestartActivity.EXTRA_RESTART, true);
         return intent;
     }
 }