[SyncFS] Rename kind() to file_kind

chrome/browser/sync_file_system/drive_backend/metadata_database.proto

 // Copyright 2013 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.
 //
 // Protocol buffer definitions for Drive backend of Syncable FileSystem.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package sync_file_system.drive_backend;
 
 enum FileKind {
-  KIND_UNSUPPORTED = 0;
-  KIND_FILE = 1;
-  KIND_FOLDER = 2;
+  FILE_KIND_UNSUPPORTED = 0;
+  FILE_KIND_FILE = 1;
+  FILE_KIND_FOLDER = 2;
 }
 
 message ServiceMetadata {
   optional int64 largest_change_id = 1;
   optional int64 sync_root_tracker_id = 2;
 
   // The sequence number of FileTrackers. Must be positive.
   optional int64 next_tracker_id = 3;
 }
 
 // Holds details of file/folder metadata.
 message FileDetails {
   repeated string parent_folder_ids = 1;
 
   optional string title = 2;
-  optional FileKind kind = 3;
+  optional FileKind file_kind = 3;
   optional string md5 = 4;
   optional string etag = 5;
 
   // Creation time and modification time of the resource.
   // Serialized by Time::ToInternalValue.
   optional int64 creation_time = 6;
   optional int64 modification_time = 7;
 
   optional bool deleted = 8;
   optional int64 change_id = 9;
@@ skipping 27 matching lines @@
 
   // True if the FileTracker is active.
   // Remote file modification should only be applied to active trackers.
   // Active FileTracker must have a unique title under its parent.
   optional bool active = 8;
 
   // Valid only for folders.
   // True if the folder contents have not yet been fetched.
   optional bool needs_folder_listing = 9;
 }