Apply gn format with 'sources' sorting to src/

third_party/iaccessible2/BUILD.gn

 # 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.
 
 assert(is_win)
 
 import("//build/toolchain/win/midl.gni")
 
 midl("iaccessible2") {
   sources = [
     "ia2_api_all.idl",
   ]
 }
 
 # Generate a proxy DLL from the generated code.
 shared_library("IAccessible2Proxy") {
   sources = [
-    "IAccessible2Proxy.def",
     "$target_gen_dir/ia2_api_all.dlldata.c",
     "$target_gen_dir/ia2_api_all_p.c",
+    "IAccessible2Proxy.def",
   ]
 
   defines = [ "REGISTER_PROXY_DLL" ]
 
   libs = [ "rpcrt4.lib" ]
 
   deps = [
     ":iaccessible2",
   ]
 }