Add language_prefs namespace to language_preferences.h.

chrome/browser/chromeos/language_preferences_unittest.cc

 // Copyright (c) 2010 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/chromeos/language_preferences.h"
 
 #include <cstring>
 #include <set>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
+namespace language_prefs {
 
 namespace {
 
 // Compares |a| and |b| and returns true if a is equal to b. The second one is a
 // specialized function for LanguageMultipleChoicePreference<const char*>.
 template <typename T>
 bool Compare(T a, T b) {
   return a == b;
 }
 template <>
@@ skipping 107 matching lines @@
   EXPECT_TRUE(CheckDefaultValueOfIntegerRangePrefs(
       kChewingIntegerPrefs, kNumChewingIntegerPrefs));
   EXPECT_TRUE(CheckDefaultValueOfIntegerRangePrefs(
       kMozcIntegerPrefs, kNumMozcIntegerPrefs));
   EXPECT_TRUE(CheckDefaultValueOfIntegerRangePrefs(
       &kXkbAutoRepeatDelayPref, 1));
   EXPECT_TRUE(CheckDefaultValueOfIntegerRangePrefs(
       &kXkbAutoRepeatIntervalPref, 1));
 }
 
+}  // namespace language_prefs
 }  // namespace chromeos