Apply gn format with 'sources' sorting to src/

ipc/mojo/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.
 
 import("//testing/test.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
 mojom("client_channel") {
   sources = [
     "client_channel.mojom",
   ]
 }
 
 component("mojo") {
   sources = [
-    "client_channel.mojom",
     "async_handle_waiter.cc",
     "async_handle_waiter.h",
+    "client_channel.mojom",
     "ipc_channel_mojo.cc",
     "ipc_channel_mojo.h",
     "ipc_channel_mojo_host.cc",
     "ipc_channel_mojo_host.h",
+    "ipc_message_pipe_reader.cc",
+    "ipc_message_pipe_reader.h",
     "ipc_mojo_bootstrap.cc",
     "ipc_mojo_bootstrap.h",
     "ipc_mojo_handle_attachment.cc",
     "ipc_mojo_handle_attachment.h",
     "ipc_mojo_message_helper.cc",
     "ipc_mojo_message_helper.h",
-    "ipc_message_pipe_reader.cc",
-    "ipc_message_pipe_reader.h",
   ]
 
   defines = [ "IPC_MOJO_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//ipc",
     "//mojo/environment:chromium",
     "//third_party/mojo/src/mojo/edk/system",
@@ skipping 36 matching lines @@
     "//base/test:test_support_perf",
     "//base/third_party/dynamic_annotations",
     "//ipc",
     "//ipc:test_support",
     "//ipc/mojo",
     "//mojo/environment:chromium",
     "//third_party/mojo/src/mojo/edk/system",
     "//url",
   ]
 }