Delete prefix-set if side-effect-free whitelist not enabled.

chrome/browser/safe_browsing/safe_browsing_database.cc

Index: chrome/browser/safe_browsing/safe_browsing_database.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_database.cc b/chrome/browser/safe_browsing/safe_browsing_database.cc
index 868c732a39bbd5c586a2096fdd4147ae3a9e80d4..e379bd6a68c7f83f83d1c4a2082a938cb6cce188 100644
--- a/chrome/browser/safe_browsing/safe_browsing_database.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_database.cc
@@ -604,6 +604,9 @@ void SafeBrowsingDatabaseNew::Init(const base::FilePath& filename_base) {
     // from when it was previously enabled.
     SafeBrowsingStoreFile::DeleteStore(
         SideEffectFreeWhitelistDBFilename(filename_base));
+    base::DeleteFile(
+        PrefixSetForFilename(SideEffectFreeWhitelistDBFilename(filename_base)),
+        false);
   }
 
   if (ip_blacklist_store_.get()) {