Move //mojo/shell to //shell

shell/android/apk/src/org/chromium/mojo_shell_apk/MojoMain.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.content.Context;
 
 import org.chromium.base.JNINamespace;
 
@@ skipping 34 matching lines @@
         nativeStart(appUrl);
     }
 
     /**
      * Initializes the native system. This API should be called only once per process.
      **/
     private static native void nativeInit(Context context, String[] parameters);
 
     private static native void nativeStart(String appUrl);
 }