Make Error.prototype.toString spec compliant; and fix various side-effect-free error printing metho…

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index 7f86e5c59961092cb6da677b4ed5e88768286113..15f2ffac7436d0e79bdfa55093cc3f8496c59a5a 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -433,12 +433,6 @@ void StackGuard::InitThread(const ExecutionAccess& lock) {
   } while (false)
 
 
-MaybeHandle<Object> Execution::ToDetailString(
-    Isolate* isolate, Handle<Object> obj) {
-  RETURN_NATIVE_CALL(to_detail_string, { obj });
-}
-
-
 MaybeHandle<Object> Execution::NewDate(Isolate* isolate, double time) {
   Handle<Object> time_obj = isolate->factory()->NewNumber(time);
   RETURN_NATIVE_CALL(create_date, { time_obj });