Simplify isolates access during stack iteration (WAS: Move SafeStackFrameIterator::active_count_...)

src/accessors.cc

Index: src/accessors.cc
diff --git a/src/accessors.cc b/src/accessors.cc
index ee7636ec4b3ebbd7ef60b389026b488f2e1542f7..5f9bf744af80c13e0b9580da190845019cd8017a 100644
--- a/src/accessors.cc
+++ b/src/accessors.cc
@@ -603,7 +603,7 @@ MaybeObject* Accessors::FunctionGetArguments(Object* object, void*) {
 
   // Find the top invocation of the function by traversing frames.
   List<JSFunction*> functions(2);
-  for (JavaScriptFrameIterator it; !it.done(); it.Advance()) {
+  for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) {
     JavaScriptFrame* frame = it.frame();
     frame->GetFunctions(&functions);
     for (int i = functions.length() - 1; i >= 0; i--) {
@@ -692,7 +692,7 @@ MaybeObject* Accessors::FunctionGetCaller(Object* object, void*) {
   Handle<JSFunction> function(holder, isolate);
 
   List<JSFunction*> functions(2);
-  for (JavaScriptFrameIterator it; !it.done(); it.Advance()) {
+  for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) {
     JavaScriptFrame* frame = it.frame();
     frame->GetFunctions(&functions);
     for (int i = functions.length() - 1; i >= 0; i--) {