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

chrome/browser/autofill/personal_data_manager.cc

Index: chrome/browser/autofill/personal_data_manager.cc
diff --git a/chrome/browser/autofill/personal_data_manager.cc b/chrome/browser/autofill/personal_data_manager.cc
index 76b5961a302701c2a89ecd48a2592dd2a4c14b26..c4305bdfe127ccff8686406b17b8f92e7d0967a6 100644
--- a/chrome/browser/autofill/personal_data_manager.cc
+++ b/chrome/browser/autofill/personal_data_manager.cc
@@ -26,6 +26,7 @@
 #include "chrome/browser/autofill/validation.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
+#include "components/user_prefs/user_prefs.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/notification_source.h"
 
@@ -495,7 +496,7 @@ bool PersonalDataManager::IsDataLoaded() const {
 }
 
 const std::vector<AutofillProfile*>& PersonalDataManager::GetProfiles() {
-  if (!PrefServiceFromBrowserContext(browser_context_)->GetBoolean(
+  if (!components::UserPrefs::Get(browser_context_)->GetBoolean(
           prefs::kAutofillAuxiliaryProfilesEnabled)) {
     return web_profiles();
   }
@@ -670,7 +671,7 @@ void PersonalDataManager::Init(BrowserContext* browser_context) {
 }
 
 bool PersonalDataManager::IsAutofillEnabled() const {
-  return PrefServiceFromBrowserContext(browser_context_)->GetBoolean(
+  return components::UserPrefs::Get(browser_context_)->GetBoolean(
       prefs::kAutofillEnabled);
 }