Extract PrefServiceBase into chrome/browser/api. Use in api and autofill.

chrome/browser/autofill/autocomplete_history_manager.cc

Index: chrome/browser/autofill/autocomplete_history_manager.cc
diff --git a/chrome/browser/autofill/autocomplete_history_manager.cc b/chrome/browser/autofill/autocomplete_history_manager.cc
index 44a46442cfb901b6800dae2efd289f3cab5a70ad..042e83783667e2055044fb29b0fe0ac13d914264 100644
--- a/chrome/browser/autofill/autocomplete_history_manager.cc
+++ b/chrome/browser/autofill/autocomplete_history_manager.cc
@@ -9,6 +9,7 @@
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/api/prefs/pref_service_base.h"
 #include "chrome/browser/autofill/autofill_external_delegate.h"
 #include "chrome/browser/autofill/credit_card.h"
 #include "chrome/browser/profiles/profile.h"
@@ -117,7 +118,8 @@ AutocompleteHistoryManager::AutocompleteHistoryManager(
   // May be NULL in unit tests.
   web_data_service_ = WebDataServiceFactory::GetForProfile(
       profile_, Profile::EXPLICIT_ACCESS);
-  autofill_enabled_.Init(prefs::kAutofillEnabled, profile_->GetPrefs(), NULL);
+  autofill_enabled_.Init(
+      prefs::kAutofillEnabled, PrefServiceBase::ForProfile(profile_), NULL);
 }
 
 AutocompleteHistoryManager::~AutocompleteHistoryManager() {
@@ -244,7 +246,7 @@ AutocompleteHistoryManager::AutocompleteHistoryManager(
       query_id_(0),
       external_delegate_(NULL) {
   autofill_enabled_.Init(
-      prefs::kAutofillEnabled, profile_->GetPrefs(), NULL);
+      prefs::kAutofillEnabled, PrefServiceBase::ForProfile(profile_), NULL);
 }
 
 void AutocompleteHistoryManager::CancelPendingQuery() {