Remove GPU service dependency on services/ui/common.

services/ui/public/cpp/gpu/BUILD.gn

 # Copyright 2016 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("//build/config/ui.gni")
 
 source_set("gpu") {
   sources = [
     "command_buffer_metrics.h",
     "context_provider_command_buffer.h",
@@ skipping 29 matching lines @@
 
   deps = [
     "//base",
     "//cc",
     "//gpu",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/skia_bindings",
     "//mojo/public/cpp/system",
     "//services/service_manager/public/cpp",
-    "//services/ui/common:mus_common",
     "//services/ui/public/interfaces",
   ]
 }