Don't store empty values for autofill

chrome/browser/browser_prefs.cc

Index: chrome/browser/browser_prefs.cc
===================================================================
--- chrome/browser/browser_prefs.cc	(revision 9373)
+++ chrome/browser/browser_prefs.cc	(working copy)
@@ -13,6 +13,7 @@
 #include "chrome/browser/tab_contents/web_contents.h"
 
 #if defined(OS_WIN)  // TODO(port): whittle this down as we port
+#include "chrome/browser/autofill_manager.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/net/dns_global.h"
 #include "chrome/browser/download/download_manager.h"
@@ -62,6 +63,7 @@
   DownloadManager::RegisterUserPrefs(user_prefs);
   PasswordManager::RegisterUserPrefs(user_prefs);
   SSLManager::RegisterUserPrefs(user_prefs);
+  AutofillManager::RegisterUserPrefs(user_prefs);
 #endif
   TabContents::RegisterUserPrefs(user_prefs);
   TemplateURLPrepopulateData::RegisterUserPrefs(user_prefs);