[Android] Simplify logic for grabbing initial country-code.

ui/base/l10n/l10n_util_android.h

 // 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.
 
 #ifndef UI_BASE_L10N_L10N_UTIL_ANDROID_H_
 #define UI_BASE_L10N_L10N_UTIL_ANDROID_H_
 
 #include <jni.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "ui/base/ui_base_export.h"
 
 namespace l10n_util {
 
-// Return the current default locale of the device.
-UI_BASE_EXPORT std::string GetDefaultLocale();
-
 UI_BASE_EXPORT base::string16 GetDisplayNameForLocale(
     const std::string& locale,
     const std::string& display_locale);
 
 UI_BASE_EXPORT bool IsLayoutRtl();
 
 UI_BASE_EXPORT bool RegisterLocalizationUtil(JNIEnv* env);
 
 }  // namespace l10n_util
 
 #endif  // UI_BASE_L10N_L10N_UTIL_ANDROID_H_