Remove several JSFunction delegator functions.

src/debug/debug.cc

Index: src/debug/debug.cc
diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index 92699bcd4bf9f5d21c723d2a443cdbeb3ddbb1c8..d99435c845756c5757a50498a5374662a8b22492 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -923,7 +923,7 @@ void Debug::PrepareStep(StepAction step_action,
     }
     // Skip native and extension functions on the stack.
     while (!frames_it.done() &&
-           !frames_it.frame()->function()->IsSubjectToDebugging()) {
+           !frames_it.frame()->function()->shared()->IsSubjectToDebugging()) {
       frames_it.Advance();
     }
     // Step out: If there is a JavaScript caller frame, we need to
@@ -2244,7 +2244,7 @@ void Debug::HandleDebugBreak() {
     Object* fun = it.frame()->function();
     if (fun && fun->IsJSFunction()) {
       // Don't stop in builtin functions.
-      if (!JSFunction::cast(fun)->IsSubjectToDebugging()) return;
+      if (!JSFunction::cast(fun)->shared()->IsSubjectToDebugging()) return;
       JSGlobalObject* global =
           JSFunction::cast(fun)->context()->global_object();
       // Don't stop in debugger functions.