Move chrome.fileSystem implementation to //extensions

extensions/browser/api/extensions_api_client.cc

 // Copyright 2014 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 "extensions/browser/api/extensions_api_client.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "extensions/browser/api/device_permissions_prompt.h"
 #include "extensions/browser/api/virtual_keyboard_private/virtual_keyboard_delegate.h"
@@ skipping 90 matching lines @@
 
 MetricsPrivateDelegate* ExtensionsAPIClient::GetMetricsPrivateDelegate() {
   return nullptr;
 }
 
 NetworkingCastPrivateDelegate*
 ExtensionsAPIClient::GetNetworkingCastPrivateDelegate() {
   return nullptr;
 }
 
+FileSystemDelegate* ExtensionsAPIClient::GetFileSystemDelegate() {
+  return nullptr;
+}
+
 #if defined(OS_CHROMEOS)
 NonNativeFileSystemDelegate*
 ExtensionsAPIClient::GetNonNativeFileSystemDelegate() {
   return nullptr;
 }
 
 void ExtensionsAPIClient::SaveImageDataToClipboard(
     const std::vector<char>& image_data,
     api::clipboard::ImageType type,
     AdditionalDataItemList additional_items,
     const base::Closure& success_callback,
     const base::Callback<void(const std::string&)>& error_callback) {}
 #endif
 
 }  // namespace extensions