Implement the file chooser as a new resource "host"

ppapi/proxy/ppapi_proxy_test.cc

 // Copyright (c) 2012 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.
 
 #include "ppapi/proxy/ppapi_proxy_test.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop_proxy.h"
 #include "base/observer_list.h"
@@ skipping 392 matching lines @@
       base::Bind(&TearDownRemoteHarness,
                  remote_harness_,
                  &remote_harness_torn_down));
   remote_harness_torn_down.Wait();
 
   local_harness_->TearDownHarness();
 
   io_thread_.Stop();
 }
 
-
 }  // namespace proxy
 }  // namespace ppapi