Revert of ApplicationImpl cleanup, part 1:

components/filesystem/file_system_app.cc

 // Copyright 2015 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 "components/filesystem/file_system_app.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_impl.h"
@@ skipping 49 matching lines @@
 
 void FileSystemApp::OnDirectoryConnectionError(DirectoryImpl* directory) {
   for (std::vector<Client>::iterator it = client_mapping_.begin();
        it != client_mapping_.end(); ++it) {
     if (it->directory_ == directory) {
       client_mapping_.erase(it);
 
       if (in_shutdown_ && client_mapping_.empty()) {
         // We just cleared the last directory after our shell connection went
         // away. Time to shut ourselves down.
-        app_->Quit();
+        app_->QuitNow();
       }
 
       return;
     }
   }
 }
 
 FileSystemApp::Client::Client(DirectoryImpl* directory,
                               FileSystemClientPtr fs_client)
     : directory_(directory),
       fs_client_(fs_client.Pass()) {
 }
 
 FileSystemApp::Client::Client(Client&& rhs)
     : directory_(rhs.directory_),
       fs_client_(rhs.fs_client_.Pass()) {
 }
 
 FileSystemApp::Client::~Client() {}
 
 FileSystemApp::Client& FileSystemApp::Client::operator=(
     FileSystemApp::Client&& rhs) {
   directory_ = rhs.directory_;
   fs_client_ = rhs.fs_client_.Pass();
   return *this;
 }
 
 }  // namespace filesystem