Move chrome.fileSystem implementation to //extensions

extensions/browser/api/extensions_api_client.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_
 #define EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 17 matching lines @@
 class GuestViewManagerDelegate;
 }  // namespace guest_view
 
 namespace extensions {
 
 class AppViewGuestDelegate;
 class ContentRulesRegistry;
 class DevicePermissionsPrompt;
 class ExtensionOptionsGuest;
 class ExtensionOptionsGuestDelegate;
+class FileSystemDelegate;
 class ManagementAPIDelegate;
 class MetricsPrivateDelegate;
 class MimeHandlerViewGuest;
 class MimeHandlerViewGuestDelegate;
 class NetworkingCastPrivateDelegate;
 class NonNativeFileSystemDelegate;
 class RulesCacheDelegate;
 class SettingsObserver;
 class ValueStoreCache;
 class ValueStoreFactory;
@@ skipping 82 matching lines @@
   // Creates a delegate for handling the management extension api.
   virtual ManagementAPIDelegate* CreateManagementAPIDelegate() const;
 
   // If supported by the embedder, returns a delegate for embedder-dependent
   // MetricsPrivateAPI behavior.
   virtual MetricsPrivateDelegate* GetMetricsPrivateDelegate();
 
   // Creates a delegate for networking.castPrivate's API behavior.
   virtual NetworkingCastPrivateDelegate* GetNetworkingCastPrivateDelegate();
 
+  // Returns a delegate for embedder-specific chrome.fileSystem behavior.
+  virtual FileSystemDelegate* GetFileSystemDelegate();
+
 #if defined(OS_CHROMEOS)
   // If supported by the embedder, returns a delegate for querying non-native
   // file systems.
   virtual NonNativeFileSystemDelegate* GetNonNativeFileSystemDelegate();
 
   // Saves image data on clipboard.
   virtual void 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
 
   // NOTE: If this interface gains too many methods (perhaps more than 20) it
   // should be split into one interface per API.
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_EXTENSIONS_API_CLIENT_H_