Revert "Move gn setup for vulkan library/headers into their own third_party directory."

This reverts commit 477094250cd55a38d4d796ab6c50eb57bdba65e1.

Reason for revert:
I think we know this broke the MoltenVK bots.  It also appears to have broken the Fuchsia roll: https://logs.chromium.org/v/?s=fuchsia%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8945885190914943680%2F%2B%2Fsteps%2Fbuild%2F0%2Fsteps%2Fbuild_fuchsia%2F0%2Fsteps%2Fgn_gen%2F0%2Fstdout

Original change's description:
> Move gn setup for vulkan library/headers into their own third_party directory.
> 
> Bug: skia:
> Change-Id: I4605f0d962271efb77bf3c17f1b0daaaddfb51c8
> Reviewed-on: https://skia-review.googlesource.com/128540
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>

TBR=egdaniel@google.com,mtklein@google.com,bungeman@google.com

Change-Id: I6e41d98e39883eff34424a2f352b0c8adec178db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/129444
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 0 insertions, 65 deletions

diff --git a/third_party/vulkan/BUILD.gn b/third_party/vulkan/BUILD.gn
deleted file mode 100644
index 8fbf555bb5..0000000000
--- a/third_party/vulkan/BUILD.gn
+++ /dev/null
@@ -1,65 +0,0 @@
-# Copyright 2018 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-declare_args() {
-  skia_vulkan_header = ""
-  skia_tools_vulkan_header_dir = ""
-
-  # When buliding on Android we get the header via the NDK so no need for any extra path.
-  if (is_fuchsia) {
-    skia_tools_vulkan_header_dir = "$fuchsia_vulkan_sdk/include"
-  } else if (is_linux || is_win) {
-    skia_tools_vulkan_header_dir = "$skia_vulkan_sdk/include"
-  }
-}
-
-config("moltenvk") {
-  if (is_ios) {
-    moltenvk_framework_path = "$skia_moltenvk_path/MoltenVK/iOS"
-  } else {
-    moltenvk_framework_path = "$skia_moltenvk_path/MoltenVK/macOS"
-  }
-  cflags = [
-    "-F$moltenvk_framework_path",
-    "-isystem$skia_moltenvk_path/MoltenVK/include",  # for <vulkan/vulkan.h>
-  ]
-  ldflags = [ "-F$moltenvk_framework_path" ]
-  libs = [
-    "MoltenVK.framework",
-    "Metal.framework",
-    "IOSurface.framework",
-    "QuartzCore.framework",
-    "Foundation.framework",
-  ]
-  if (is_ios) {
-    libs += [ "UIKit.framework" ]
-  } else {
-    libs += [ "IOKit.framework" ]
-  }
-  defines = [ "SK_MOLTENVK" ]
-}
-
-config("vulkan_config") {
-  include_dirs = []
-  if (skia_tools_vulkan_header_dir != "") {
-    include_dirs += [ skia_tools_vulkan_header_dir ]
-  }
-  defines = [ "SK_VULKAN" ]
-  if (skia_vulkan_header != "") {
-    defines += [ "SK_VULKAN_HEADER=\"$skia_vulkan_header\"" ]
-  } else if (skia_moltenvk_path != "") {
-    defines += [ "SK_VULKAN_HEADER=<MoltenVK/mvk_vulkan.h>" ]
-  } else if (defined(is_skia_standalone) && is_skia_standalone &&
-             !is_official_build) {
-    defines += [ "SK_VULKAN_HEADER=\"GrVulkanDefines.h\"" ]
-  }
-  if (skia_moltenvk_path != "") {
-    public_configs += [ ":moltenvk" ]
-  }
-}
-
-source_set("vulkan") {
-  public_configs = [ ":vulkan_config" ]
-}