Revert of memory-infra: Finish moving to Mojo (2nd attempt)

services/resource_coordinator/public/interfaces/BUILD.gn

 # Copyright 2017 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("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
-    "memory/constants.mojom",
     "memory/memory_instrumentation.mojom",
     "tracing/tracing.mojom",
   ]
 
   public_deps = [
     "//mojo/common:common_custom_types",
   ]
 }