Replace OVERRIDE->override and FINAL->final since we now require C++11.

src/optimizing-compile-dispatcher.cc

Index: src/optimizing-compile-dispatcher.cc
diff --git a/src/optimizing-compile-dispatcher.cc b/src/optimizing-compile-dispatcher.cc
index e422913241047d02e7de1a3448aee6b64b2acb8b..491f52a2bb6c257b513b95391f09547273f59f61 100644
--- a/src/optimizing-compile-dispatcher.cc
+++ b/src/optimizing-compile-dispatcher.cc
@@ -52,7 +52,7 @@ class OptimizingCompileDispatcher::CompileTask : public v8::Task {
 
  private:
   // v8::Task overrides.
-  void Run() OVERRIDE {
+  void Run() override {
     DisallowHeapAllocation no_allocation;
     DisallowHandleAllocation no_handles;
     DisallowHandleDereference no_deref;