The UI language rather than the locale is now used to pick Chrome's language ...

app/l10n_util_win.h

Index: app/l10n_util_win.h
===================================================================
--- app/l10n_util_win.h	(revision 66182)
+++ app/l10n_util_win.h	(working copy)
@@ -7,6 +7,8 @@
 #pragma once
 
 #include <windows.h>
+#include <string>
+#include <vector>
 
 namespace l10n_util {
 
@@ -47,6 +49,15 @@
 // stored in the per-locale resource.
 void AdjustUIFontForWindow(HWND hwnd);
 
+// Allow processes to override the configured locale with the user's Windows UI
+// languages.  This function should generally be called once early in
+// Application startup.
+void OverrideLocaleWithUILanguageList();
+
+// Retrieve the locale override, or an empty vector if the locale has not been
+// or failed to be overridden.
+const std::vector<std::string>& GetLocaleOverrides();
+
 }  // namespace l10n_util
 
 #endif  // APP_L10N_UTIL_WIN_H_