FileSystem mods: Remove some dead snapshot creation code.

content/common/fileapi/file_system_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for the file system.
 // Multiply-included message file, hence no include guard.
 
 #include "base/files/file_util_proxy.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 132 matching lines @@
 // Pepper's OpenFile message.
 IPC_MESSAGE_CONTROL3(FileSystemHostMsg_OpenFile,
                      int /* request id */,
                      GURL /* file path */,
                      int /* file flags */)
 
 // Pepper's NotifyCloseFile message.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_NotifyCloseFile,
                      GURL /* file path */)
 
-// DEPRECATED
-IPC_MESSAGE_CONTROL3(FileSystemHostMsg_CreateSnapshotFile_Deprecated,
-                     int /* request_id */,
-                     GURL /* blob_url */,
-                     GURL /* file_path */)
-
 // WebFileSystem::createSnapshotFileAndReadMetadata() message.
 IPC_MESSAGE_CONTROL2(FileSystemHostMsg_CreateSnapshotFile,
                      int /* request_id */,
                      GURL /* file_path */)
 
 // Renderers are expected to send this message after having processed
 // the FileSystemMsg_DidCreateSnapshotFile message. In particular,
 // after having created a BlobDataHandle backed by the snapshot file.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_DidReceiveSnapshotFile,
                      int /* request_id */)
 
 // For Pepper's URL loader.
 IPC_SYNC_MESSAGE_CONTROL1_1(FileSystemHostMsg_SyncGetPlatformPath,
                             GURL /* file path */,
                             base::FilePath /* platform_path */)
 
 // Pre- and post-update notifications for ppapi implementation.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_WillUpdate,
                      GURL /* file_path */)
 
 IPC_MESSAGE_CONTROL2(FileSystemHostMsg_DidUpdate,
                      GURL /* file_path */,
                      int64 /* delta */)