AppCache: Run a quick integrity check on the sqlite database when opening.

webkit/browser/appcache/appcache_database.cc

Index: webkit/browser/appcache/appcache_database.cc
diff --git a/webkit/browser/appcache/appcache_database.cc b/webkit/browser/appcache/appcache_database.cc
index a3dadd9eaf5515cc1f90381f636c5de6e645bfba..0980973d49ef04a31b20c2ff15ee8401571552b2 100644
--- a/webkit/browser/appcache/appcache_database.cc
+++ b/webkit/browser/appcache/appcache_database.cc
@@ -1019,7 +1019,7 @@ bool AppCacheDatabase::LazyOpen(bool create_if_needed) {
       db_->Preload();
   }
 
-  if (!opened || !EnsureDatabaseVersion()) {
+  if (!opened || !db_->QuickIntegrityCheck() || !EnsureDatabaseVersion()) {
     LOG(ERROR) << "Failed to open the appcache database.";
     AppCacheHistograms::CountInitResult(
         AppCacheHistograms::SQL_DATABASE_ERROR);