Remove SkMovie and giflib

third_party/giflib/BUILD.gn

Index: third_party/giflib/BUILD.gn
diff --git a/third_party/giflib/BUILD.gn b/third_party/giflib/BUILD.gn
deleted file mode 100644
index a82bf921fbbca10bfdb58d432b96adfa09f40c9d..0000000000000000000000000000000000000000
--- a/third_party/giflib/BUILD.gn
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright 2016 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-declare_args() {
-}
-
-import("../third_party.gni")
-
-third_party("giflib") {
-  public_include_dirs = [ "../externals/giflib" ]
-
-  if (is_win) {
-    include_dirs = [ "." ]
-  }
-
-  sources = [
-    "../externals/giflib/dgif_lib.c",
-    "../externals/giflib/gif_err.c",
-    "../externals/giflib/gifalloc.c",
-  ]
-}