sync: Put sqlite_utils.* into sqlite_utils namespace.

chrome/browser/sync/syncable/directory_backing_store.h

Index: chrome/browser/sync/syncable/directory_backing_store.h
diff --git a/chrome/browser/sync/syncable/directory_backing_store.h b/chrome/browser/sync/syncable/directory_backing_store.h
index 088c6da32fc1baee402b2e7a6971f5dbaba68a85..259c4c471a129be567ee0bef02c403ec12de38ce 100644
--- a/chrome/browser/sync/syncable/directory_backing_store.h
+++ b/chrome/browser/sync/syncable/directory_backing_store.h
@@ -16,10 +16,11 @@
 
 extern "C" {
 struct sqlite3;
-struct sqlite3_stmt;
 }
 
+namespace sqlite_utils {
 class SQLStatement;
+}
 
 namespace sync_pb {
 class EntitySpecifics;
@@ -166,7 +167,7 @@ class DirectoryBackingStore {
   bool MigrateToSpecifics(const char* old_columns,
                           const char* specifics_column,
                           void(*handler_function) (
-                              SQLStatement* old_value_query,
+                              sqlite_utils::SQLStatement* old_value_query,
                               int old_value_column,
                               sync_pb::EntitySpecifics* mutable_new_value));