Introduce //components/user_prefs, use to eliminate c/b/prefs dependency in Autofill.

components/user_prefs/user_prefs_delegate.h

+// 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.
+
+#ifndef COMPONENTS_USER_PREFS_USER_PREFS_DELEGATE_H_
+#define COMPONENTS_USER_PREFS_USER_PREFS_DELEGATE_H_
+
+class PrefService;
+
+namespace content {
+class BrowserContext;
+};

[tfarina, 2013/02/27 15:17:50]

no need of ; here

+
+namespace components {
+
+class UserPrefsDelegate {
+ public:
+  virtual ~UserPrefsDelegate() {}

[tfarina, 2013/02/27 15:17:50]

this can't be protected, right?

+
+  // Return the PrefService associated with |context| or NULL if there is none.
+  virtual PrefService* PrefServiceFromBrowserContext(
+      content::BrowserContext* context) = 0;
+};
+
+}  // namespace components
+
+#endif  // COMPONENTS_USER_PREFS_USER_PREFS_DELEGATE_H_