Handlify DeoptimizedFrameInfo, remove custom GC iteration.

src/debug/debug-evaluate.cc

Index: src/debug/debug-evaluate.cc
diff --git a/src/debug/debug-evaluate.cc b/src/debug/debug-evaluate.cc
index 25283d2ebd26e5e42c928436a4d4e38c1480ce13..1134c9dd68ae9cfec97deb3a1bed09c7663a6d61 100644
--- a/src/debug/debug-evaluate.cc
+++ b/src/debug/debug-evaluate.cc
@@ -128,7 +128,7 @@ DebugEvaluate::ContextBuilder::ContextBuilder(Isolate* isolate,
       inlined_jsframe_index_(inlined_jsframe_index) {
   FrameInspector frame_inspector(frame, inlined_jsframe_index, isolate);
   Handle<JSFunction> local_function =
-      handle(JSFunction::cast(frame_inspector.GetFunction()));
+      Handle<JSFunction>::cast(frame_inspector.GetFunction());
   Handle<Context> outer_context(local_function->context());
   native_context_ = Handle<Context>(outer_context->native_context());
   Handle<JSFunction> global_function(native_context_->closure());