Mode clean-up pt 1: rename classic/non-strict mode to sloppy mode

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index 690a4e3f4e6cd8570a0b052ee643b8fedb24aa69..6598ebe0f48bdf527923dad4e0bfbe70680461f2 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -163,9 +163,9 @@ Handle<Object> Execution::Call(Isolate* isolate,
   }
   Handle<JSFunction> func = Handle<JSFunction>::cast(callable);
 
-  // In non-strict mode, convert receiver.
+  // In sloppy mode, convert receiver.
   if (convert_receiver && !receiver->IsJSReceiver() &&
-      !func->shared()->native() && func->shared()->is_classic_mode()) {
+      !func->shared()->native() && func->shared()->is_sloppy_mode()) {
     if (receiver->IsUndefined() || receiver->IsNull()) {
       Object* global = func->context()->global_object()->global_receiver();
       // Under some circumstances, 'global' can be the JSBuiltinsObject