Add ppapi, improve Windows GN build.

content/common/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.
 
 # TODO(brettw) this file is a work in progress, it is not currently hooked up
 # to the build, but currently represents the state of content/common's deps.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/common/common.gni")
@@ skipping 219 matching lines @@
       #"//media",
       "//ui/gl",
     ]
 
     # TODO(GYP): extract_xinput action.
   }
 
   if (!is_win || !use_aura) {
     sources -= [ "cursors/webcursor_aurawin.cc" ]
   }
-  if (!use_aura || !use_x11) {
-    sources -= [ "cursors/webcursor_aurax11.cc" ]
-  }
 
   if (use_seccomp_bpf) {
     defines += [ "USE_SECCOMP_BPF" ]
   } else {
     if (is_linux) {
       sources -= [
         "sandbox_linux/bpf_cros_arm_gpu_policy_linux.cc",
         "sandbox_linux/bpf_cros_arm_gpu_policy_linux.h",
         "sandbox_linux/bpf_gpu_policy_linux.cc",
         "sandbox_linux/bpf_gpu_policy_linux.h",
         "sandbox_linux/bpf_ppapi_policy_linux.cc",
         "sandbox_linux/bpf_ppapi_policy_linux.h",
         "sandbox_linux/bpf_renderer_policy_linux.cc",
         "sandbox_linux/bpf_renderer_policy_linux.h",
         "sandbox_linux/sandbox_bpf_base_policy_linux.cc",
         "sandbox_linux/sandbox_bpf_base_policy_linux.h",
       ]
     }
     if (is_android) {
       sources -= [
         "sandbox_linux/android/sandbox_bpf_base_policy_android.cc",
         "sandbox_linux/android/sandbox_bpf_base_policy_android.h",
       ]
     }
   }
 }