[inspector] store stack frame in struct instead of JSObject

src/api.h

Index: src/api.h
diff --git a/src/api.h b/src/api.h
index 8deb117bccd2154f6a9b63fa011b4110b12ab169..7be1e6727351b46168cb287412b5ccdb03a8c13d 100644
--- a/src/api.h
+++ b/src/api.h
@@ -106,7 +106,7 @@ class RegisteredExtension {
   V(Context, Context)                          \
   V(External, Object)                          \
   V(StackTrace, JSArray)                       \
-  V(StackFrame, JSObject)                      \
+  V(StackFrame, StackFrameInfo)                \
   V(Proxy, JSProxy)                            \
   V(NativeWeakMap, JSWeakMap)                  \
   V(debug::GeneratorObject, JSGeneratorObject) \
@@ -188,7 +188,7 @@ class Utils {
   static inline Local<StackTrace> StackTraceToLocal(
       v8::internal::Handle<v8::internal::JSArray> obj);
   static inline Local<StackFrame> StackFrameToLocal(
-      v8::internal::Handle<v8::internal::JSObject> obj);
+      v8::internal::Handle<v8::internal::StackFrameInfo> obj);
   static inline Local<Number> NumberToLocal(
       v8::internal::Handle<v8::internal::Object> obj);
   static inline Local<Integer> IntegerToLocal(
@@ -318,7 +318,7 @@ MAKE_TO_LOCAL(AccessorSignatureToLocal, FunctionTemplateInfo, AccessorSignature)
 MAKE_TO_LOCAL(MessageToLocal, Object, Message)
 MAKE_TO_LOCAL(PromiseToLocal, JSObject, Promise)
 MAKE_TO_LOCAL(StackTraceToLocal, JSArray, StackTrace)
-MAKE_TO_LOCAL(StackFrameToLocal, JSObject, StackFrame)
+MAKE_TO_LOCAL(StackFrameToLocal, StackFrameInfo, StackFrame)
 MAKE_TO_LOCAL(NumberToLocal, Object, Number)
 MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
 MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)