Update bindings classes to use OVERRIDE / FINAL when needed

Source/bindings/v8/custom/V8PromiseCustom.cpp

Index: Source/bindings/v8/custom/V8PromiseCustom.cpp
diff --git a/Source/bindings/v8/custom/V8PromiseCustom.cpp b/Source/bindings/v8/custom/V8PromiseCustom.cpp
index eeabb25ce2dbbde2fdceb4f9f0e2c878957ebce1..657647def5ef4c458825c74de04b51cee8565b41 100644
--- a/Source/bindings/v8/custom/V8PromiseCustom.cpp
+++ b/Source/bindings/v8/custom/V8PromiseCustom.cpp
@@ -190,7 +190,7 @@ void addToDerived(v8::Handle<v8::Object> internal, v8::Handle<v8::Object> derive
     ASSERT(fulfillCallbacks->Length() == rejectCallbacks->Length() && rejectCallbacks->Length() == derivedPromises->Length());
 }
 
-class CallHandlerTask : public ExecutionContextTask {
+class CallHandlerTask FINAL : public ExecutionContextTask {
 public:
     CallHandlerTask(v8::Handle<v8::Object> promise, v8::Handle<v8::Function> handler, v8::Handle<v8::Value> argument, v8::Isolate* isolate, ExecutionContext* context)
         : m_promise(isolate, promise)
@@ -231,7 +231,7 @@ void CallHandlerTask::performTask(ExecutionContext* context)
     }
 }
 
-class UpdateDerivedTask : public ExecutionContextTask {
+class UpdateDerivedTask FINAL : public ExecutionContextTask {
 public:
     UpdateDerivedTask(v8::Handle<v8::Object> promise, v8::Handle<v8::Function> onFulfilled, v8::Handle<v8::Function> onRejected, v8::Handle<v8::Object> originatorValueObject, v8::Isolate* isolate, ExecutionContext* context)
         : m_promise(isolate, promise)