Mojo: Simplify typemap usage.

gpu/command_buffer/common/BUILD.gn

 # Copyright (c) 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.
 
 # The files here go into the "gpu" component in a component build (with
 # "command_buffer_common" just forwarding) and goes into a static library in
 # non-component build. This needs to match the GYP build which was likely an
 # attempt to make larger components to help with loading.
 import("//mojo/public/tools/bindings/mojom.gni")
 
@@ skipping 78 matching lines @@
 
 mojom("interfaces") {
   sources = [
     "capabilities.mojom",
     "command_buffer.mojom",
     "mailbox.mojom",
     "mailbox_holder.mojom",
     "sync_token.mojom",
     "value_state.mojom",
   ]
-
-  typemaps = [ "mojo.typemap" ]
-  typemap_deps = [ "//gpu/ipc/common:command_buffer_traits" ]
 }