Revert of Extract re-usable InitializeMediaFoundation()

media/base/win/BUILD.gn

Index: media/base/win/BUILD.gn
diff --git a/media/base/win/BUILD.gn b/media/base/win/BUILD.gn
deleted file mode 100644
index b6bd57964a1968ed7224957466de083ef3dcd059..0000000000000000000000000000000000000000
--- a/media/base/win/BUILD.gn
+++ /dev/null
@@ -1,15 +0,0 @@
-# Copyright 2015 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.
-
-assert(is_win)
-
-source_set("win") {
-  set_sources_assignment_filter([])
-  sources = [
-    "mf_initializer.cc",
-    "mf_initializer.h",
-  ]
-  set_sources_assignment_filter(sources_assignment_filter)
-  configs += [ "//media:media_config" ]
-}