Use Android API for GetDisplayNameForLocale().

base/android/java/org/chromium/base/LocaleUtils.java

Index: base/android/java/org/chromium/base/LocaleUtils.java
diff --git a/base/android/java/org/chromium/base/LocaleUtils.java b/base/android/java/org/chromium/base/LocaleUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..6bca1f70bd4b348533eebc844002a7c0ea78b908
--- /dev/null
+++ b/base/android/java/org/chromium/base/LocaleUtils.java
@@ -0,0 +1,26 @@
+// Copyright (c) 2012 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.
+
+package org.chromium.base;
+
+import java.util.Locale;
+
+/**
+ * This class provides the locale related methods for the native library.
+ */
+class LocaleUtils {
+
+    private LocaleUtils() { /* cannot be instantiated */ }
+
+    /**
+     * @return the default locale.
+     */
+    @CalledByNative
+    public static String getDefaultLocale() {
+        Locale locale = Locale.getDefault();
+        String language = locale.getLanguage();
+        String country = locale.getCountry();
+        return country.isEmpty() ? language : language + "-" + country;
+    }
+}