Fix ui/gl and gpu target building with GN on Windows.

build/config/win/visual_studio_version.gni

Index: build/config/win/visual_studio_version.gni
diff --git a/build/config/win/visual_studio_version.gni b/build/config/win/visual_studio_version.gni
index 24c00cd6d98a68e9e5a7faf3f8cd16b39c96fecb..6a2828c355319ec24bcf87aafe70499f599f07df 100644
--- a/build/config/win/visual_studio_version.gni
+++ b/build/config/win/visual_studio_version.gni
@@ -20,11 +20,6 @@ declare_args() {
   # This value is the default location, override if you have a different
   # installation location.
   windows_sdk_path = "C:\Program Files (x86)\Windows Kits\8.1"
-
-  # The list of include directories that are treated as "system" include
-  # directories. TODO(scottmg): These are incorrectly put on the command line
-  # in GN, they should really be stored into %INCLUDE%.
-  system_include_dirs = []
 }
 
 if (visual_studio_path == "") {
@@ -42,14 +37,3 @@ if (visual_studio_path == "") {
          "You must set the wdk_path if you set the visual studio path")
   visual_studio_runtime_dirs = []
 }
-
-# The Windows SDK include directories must be first. They both have a sal.h,
-# and the SDK one is newer and the SDK uses some newer features from it not
-# present in the Visual Studio one.
-system_include_dirs = [
-  "$windows_sdk_path\Include\shared",
-  "$windows_sdk_path\Include\um",
-  "$windows_sdk_path\Include\winrt",
-  "$visual_studio_path\VC\include",
-  "$visual_studio_path\VC\atlmfc\include",
-]