Remove base/win/metro.{cc|h} and some associated code

chrome/browser/metro_utils/BUILD.gn

Index: chrome/browser/metro_utils/BUILD.gn
diff --git a/chrome/browser/metro_utils/BUILD.gn b/chrome/browser/metro_utils/BUILD.gn
deleted file mode 100644
index c72911328fed847b7e3cdb35b1b6ab2fbaed52a6..0000000000000000000000000000000000000000
--- a/chrome/browser/metro_utils/BUILD.gn
+++ /dev/null
@@ -1,18 +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.
-
-source_set("metro_utils") {
-  deps = [
-    "//base",
-
-    # We use a few functions from here but don't depend on the resource
-    # strings. This target is indirectly linked into chrome.exe, so
-    # specifically doesn't want those strings.
-    "//chrome/installer/util:with_no_strings",
-  ]
-  sources = [
-    "metro_chrome_win.cc",
-    "metro_chrome_win.h",
-  ]
-}