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

src/execution.h

Index: src/execution.h
diff --git a/src/execution.h b/src/execution.h
index 446a459a806c6a50761c768ab17138a31ae7a474..643d84f085a450f68e1db6fcddd64f65b0a288f4 100644
--- a/src/execution.h
+++ b/src/execution.h
@@ -10,7 +10,7 @@
 namespace v8 {
 namespace internal {
 
-class Execution FINAL : public AllStatic {
+class Execution final : public AllStatic {
  public:
   // Call a function, the caller supplies a receiver and an array
   // of arguments. Arguments are Object* type. After function returns,
@@ -127,7 +127,7 @@ class PostponeInterruptsScope;
 // StackGuard contains the handling of the limits that are used to limit the
 // number of nested invocations of JavaScript and the stack size used in each
 // invocation.
-class StackGuard FINAL {
+class StackGuard final {
  public:
   // Pass the address beyond which the stack should not grow.  The stack
   // is assumed to grow downwards.
@@ -232,7 +232,7 @@ class StackGuard FINAL {
   void PushPostponeInterruptsScope(PostponeInterruptsScope* scope);
   void PopPostponeInterruptsScope();
 
-  class ThreadLocal FINAL {
+  class ThreadLocal final {
    public:
     ThreadLocal() { Clear(); }
     // You should hold the ExecutionAccess lock when you call Initialize or