Move //mojo/shell to //shell

shell/android/apk/src/org/chromium/mojo_shell_apk/MojoShellActivity.java

 // Copyright 2013 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.mojo_shell_apk;
 
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ skipping 46 matching lines @@
         // activity. If the application process is kept alive, initialization parameters sent with
         // the intent will be stale.
         // TODO(qsr): We should be passing application context here as required by
         // InitApplicationContext on the native side. Currently we can't, as PlatformViewportAndroid
         // relies on this being the activity context.
         MojoMain.ensureInitialized(this, getParametersFromIntent(getIntent()));
         MojoMain.start(url);
         Log.i(TAG, "Mojo started: " + url);
     }
 }