Implement install module verification metric.

chrome/browser/expected_install_modules_win.cc

+// Copyright (c) 2013 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.
+
+#include "chrome/browser/expected_install_modules_win.h"
+#include "base/files/file_path.h"
+#include "base/strings/string_util.h"
+
+// DO NOT REORDER THESE ELEMENTS. Their index is used as an ID in metrics

[sky, 2013/09/19 20:54:36]

Can we use strings in the reporting to avoid having to worry about indices or
name changes?

[erikwright (departed), 2013/09/24 17:33:51]

These are UMA metrics we are talking about. To send strings we would (AFAIU)
have to use a different UMA metric per entry.

+// reporting.
+extern const wchar_t* kExpectedInstallModules[] = {
+  L"chrome.dll",
+  L"icudt.dll",
+  L"chrome_frame_helper.dll",
+  L"d3dcompiler_46.dll",
+  L"libglesv2.dll",
+  L"metro_driver.dll",
+  L"pdf.dll",
+  L"widevinecdmadapter.dll",
+  L"chrome_child.dll",
+  L"d3dcompiler_43.dll",
+  L"ffmpegsumo.dll",
+  L"libegl.dll",
+  L"libpeerconnection.dll",
+  L"npchrome_frame.dll",
+  L"ppgooglenaclpluginchrome.dll",
+  L"xinput1_3.dll",
+  NULL
+};
+
+std::wstring CanonicalizeModuleName(const std::wstring& module_name) {
+  return StringToLowerASCII(base::FilePath(module_name).BaseName().value());
+}