Separate gfx_ipc into skia-dependent and non-skia-dependent parts

ui/gfx/ipc/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.
 
 component("ipc") {
   output_name = "gfx_ipc"
 
   sources = [
     "gfx_param_traits.cc",
     "gfx_param_traits.h",
     "gfx_param_traits_macros.h",
   ]
 
   defines = [ "GFX_IPC_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//ipc",
-    "//skia",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }