Standardize usage of virtual/override/final 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 01295cb478d8298cc4ba24fdbc49f9f89ffc56fd..86601f1fa975cfd7055ca712bdbc912823ea8efb 100644
--- a/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
+++ b/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
@@ -49,7 +49,7 @@ class MockDispatcher : public IndexedDBDispatcher {
   explicit MockDispatcher(ThreadSafeSender* sender)
       : IndexedDBDispatcher(sender) {}
 
-  virtual bool Send(IPC::Message* msg) override {
+  bool Send(IPC::Message* msg) override {
     delete msg;
     return true;
   }
@@ -257,7 +257,7 @@ class MockCursor : public WebIDBCursorImpl {
         reset_count_(0) {}
 
   // This method is virtual so it can be overridden in unit tests.
-  virtual void ResetPrefetchCache() override { ++reset_count_; }
+  void ResetPrefetchCache() override { ++reset_count_; }
 
   int reset_count() const { return reset_count_; }