Fix crash when ExecutionContext is torn down before a crypto operation has completed.

Source/bindings/v8/ScriptPromiseResolverWithContext.h

Index: Source/bindings/v8/ScriptPromiseResolverWithContext.h
diff --git a/Source/bindings/v8/ScriptPromiseResolverWithContext.h b/Source/bindings/v8/ScriptPromiseResolverWithContext.h
index e31854b380f4487007433871999c6ea6ff884a21..1bcef1730facbf35e452eec872a5ec44bb76012b 100644
--- a/Source/bindings/v8/ScriptPromiseResolverWithContext.h
+++ b/Source/bindings/v8/ScriptPromiseResolverWithContext.h
@@ -27,7 +27,7 @@ namespace WebCore {
 //    ExecutionContext state. When the ExecutionContext is suspended,
 //    resolve or reject will be delayed. When it is stopped, resolve or reject
 //    will be ignored.
-class ScriptPromiseResolverWithContext FINAL : public ActiveDOMObject, public RefCounted<ScriptPromiseResolverWithContext> {
+class ScriptPromiseResolverWithContext : public ActiveDOMObject, public RefCounted<ScriptPromiseResolverWithContext> {
     WTF_MAKE_NONCOPYABLE(ScriptPromiseResolverWithContext);
 
 public:
@@ -74,6 +74,9 @@ public:
         return scriptState->context()->Global();
     }
 
+protected:
+    explicit ScriptPromiseResolverWithContext(ScriptState*);
+
 private:
     enum ResolutionState {
         Pending,
@@ -82,8 +85,6 @@ private:
         ResolvedOrRejected,
     };
 
-    explicit ScriptPromiseResolverWithContext(ScriptState*);
-
     template<typename T>
     v8::Handle<v8::Value> toV8Value(const T& value)
     {