Add localized default audio device names.

media/base/media_resources.cc

+// 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.
+
+#include "media/base/media_resources.h"
+
+#include "base/logging.h"
+#include "base/strings/utf_string_conversions.h"
+
+namespace media {
+
+static LocalizedStringProvider g_localized_string_provider = nullptr;
+
+void SetLocalizedStringProvider(LocalizedStringProvider func) {
+  DCHECK(!g_localized_string_provider);

[ajm, 2015/09/18 17:48:57]

Dale, forgot to mention: I had to remove the DCHECK because some browser tests
are initializing things more than once through
chrome_render_process_observer.cc. The net/ version doesn't have the check, so I
think we're OK.

+  g_localized_string_provider = func;
+}
+
+std::string GetLocalizedStringUTF8(MessageId message_id) {
+  return base::UTF16ToUTF8(GetLocalizedStringUTF16(message_id));
+}
+
+base::string16 GetLocalizedStringUTF16(MessageId message_id) {
+  return g_localized_string_provider ? g_localized_string_provider(message_id)
+                                     : base::string16();
+}
+
+}  // namespace media