Revert of Delete base/prefs and update callers to use components.

ios/crnet/sdch_owner_pref_storage.h

 // Copyright 2015 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 IOS_CRNET_SDCH_OWNER_PREF_STORAGE_H_
 #define IOS_CRNET_SDCH_OWNER_PREF_STORAGE_H_
 
 #include "base/macros.h"
-#include "components/prefs/pref_store.h"
+#include "base/prefs/pref_store.h"
 #include "net/sdch/sdch_owner.h"
 
 class PersistentPrefStore;
 
 // Provides an implementation of SdchOwner::PrefStorage that maps to
 // Chrome's preferences system.
 class SdchOwnerPrefStorage
     : public net::SdchOwner::PrefStorage,
       public PrefStore::Observer {
  public:
@@ skipping 17 matching lines @@
 
   PersistentPrefStore* storage_;  // Non-owning.
   const std::string storage_key_;
 
   net::SdchOwner* init_observer_;  // Non-owning.
 
   DISALLOW_COPY_AND_ASSIGN(SdchOwnerPrefStorage);
 };
 
 #endif  // IOS_CRNET_SDCH_OWNER_PREF_STORAGE_H_