components: Move user_prefs into user_prefs namespace.

components/user_prefs/user_prefs.cc

 // Copyright 2013 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 "components/user_prefs/user_prefs.h"
 
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/prefs/pref_service.h"
 #include "content/public/browser/browser_context.h"
 
-namespace components {
+namespace user_prefs {
 
 namespace {
 
 void* UserDataKey() {
   // We just need a unique constant. Use the address of a static that
   // COMDAT folding won't touch in an optimizing linker.
   static int data_key = 0;
   return reinterpret_cast<void*>(&data_key);
 }
 
@@ skipping 14 matching lines @@
   DCHECK(!context->GetUserData(UserDataKey()));
   context->SetUserData(UserDataKey(), new UserPrefs(prefs));
 }
 
 UserPrefs::UserPrefs(PrefService* prefs) : prefs_(prefs) {
 }
 
 UserPrefs::~UserPrefs() {
 }
 
-}  // namespace components
+}  // namespace user_prefs