Update {virtual,override} to follow C++11 style in content.

content/child/indexed_db/indexed_db_dispatcher_unittest.cc

Index: content/child/indexed_db/indexed_db_dispatcher_unittest.cc
diff --git a/content/child/indexed_db/indexed_db_dispatcher_unittest.cc b/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
index 4f29998f02ce0c4894eddd78ea882e93c6bc130b..04a47e71f3a40c25d76a748534f19cf4fd645b4b 100644
--- a/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
+++ b/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
@@ -140,13 +140,12 @@ class CursorCallbacks : public WebIDBCallbacks {
   explicit CursorCallbacks(scoped_ptr<WebIDBCursor>* cursor)
       : cursor_(cursor) {}
 
-  virtual void onSuccess(const WebData&,
-                         const WebVector<WebBlobInfo>&) override {}
-  virtual void onSuccess(WebIDBCursor* cursor,
-                         const WebIDBKey& key,
-                         const WebIDBKey& primaryKey,
-                         const WebData& value,
-                         const WebVector<WebBlobInfo>&) override {
+  void onSuccess(const WebData&, const WebVector<WebBlobInfo>&) override {}
+  void onSuccess(WebIDBCursor* cursor,
+                 const WebIDBKey& key,
+                 const WebIDBKey& primaryKey,
+                 const WebData& value,
+                 const WebVector<WebBlobInfo>&) override {
     cursor_->reset(cursor);
   }