extensions: Cleanup class/struct fwd declarations

extensions/common/permissions/usb_device_permission_data.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_COMMON_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_
 #define EXTENSIONS_COMMON_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_
 
 #include <memory>
 #include <string>
 
 #include "extensions/common/permissions/api_permission.h"
 
 namespace base {
 
 class Value;
 
 }  // namespace base
 
-namespace device {
-class UsbDevice;
-}
-
 namespace extensions {
 
 // A pattern that can be used to match a USB device permission.
 // Should be of the format: vendorId:productId, where both vendorId and
 // productId are decimal strings representing uint16_t values.
 class UsbDevicePermissionData {
  public:
   enum SpecialValues {
     // A special interface id for stating permissions for an entire USB device,
     // no specific interface. This value must match value of Rule::ANY_INTERFACE
@@ skipping 39 matching lines @@
   int product_id_{SPECIAL_VALUE_ANY};
   // Not useful anymore. Kept around not to trigger permission change warnings
   // for existing apps.
   int interface_id_{SPECIAL_VALUE_ANY};
   int interface_class_{SPECIAL_VALUE_ANY};
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_PERMISSIONS_USB_DEVICE_PERMISSION_DATA_H_