gpu: Remove libxml dependency.

gpu/config/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("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
 
 group("config") {
   if (is_component_build) {
@@ skipping 72 matching lines @@
     "//base",
     "//third_party/re2",
     "//ui/gl",
     "//ui/gl/init",
   ]
 
   # Prefer mesa GL headers to system headers, which cause problems on Win.
   include_dirs = [ "//third_party/mesa/src/include" ]
 
   if (is_win) {
-    deps += [ "//third_party/libxml" ]
     libs = [
       "dxguid.lib",
       "setupapi.lib",
     ]
 
     if (is_chrome_branded && is_official_build) {
       sources += [
         "//third_party/amd/AmdCfxPxExt.h",
         "//third_party/amd/amd_videocard_info_win.cc",
       ]
     }
   }
   if (is_linux || is_mac) {
     deps += [ "//third_party/angle:angle_gpu_info_util" ]
   }
 }