Revert of Rewrite scopes of non-simple default arguments

src/parsing/pattern-rewriter.cc

Index: src/parsing/pattern-rewriter.cc
diff --git a/src/parsing/pattern-rewriter.cc b/src/parsing/pattern-rewriter.cc
index 808c0c096458cf7aa0f0c8a0809b5abe7e4e3423..91d75495469b9f966641eec51f772d016a056dc6 100644
--- a/src/parsing/pattern-rewriter.cc
+++ b/src/parsing/pattern-rewriter.cc
@@ -677,29 +677,9 @@
                                       RelocInfo::kNoPosition);
   }
 
-  // Two cases for scope rewriting the scope of default parameters:
-  // - Eagerly parsed arrow functions are initially parsed as having
-  //   initializers in the enclosing scope, but when the arrow is encountered,
-  //   need to be in the scope of the function.
-  // - When an extra declaration scope needs to be inserted to account for
-  //   a sloppy eval in a default parameter or function body, the initializer
-  //   needs to be in that new inner scope which was added after initial
-  //   parsing.
-  // Each of these cases can be handled by rewriting the contents of the
-  // initializer to the current scope. The source scope is typically the outer
-  // scope when one case occurs; when both cases occur, both scopes need to
-  // be included as the outer scope. (Both rewritings still need to be done
-  // to account for lazily parsed arrow functions which hit the second case.)
-  // TODO(littledan): Remove the outer_scope parameter of
-  //                  RewriteParameterInitializerScope
   if (IsBindingContext() &&
       descriptor_->declaration_kind == DeclarationDescriptor::PARAMETER &&
-      (scope()->is_arrow_scope() || scope()->is_block_scope())) {
-    if (scope()->outer_scope()->is_arrow_scope() && scope()->is_block_scope()) {
-      RewriteParameterInitializerScope(parser_->stack_limit(), initializer,
-                                       scope()->outer_scope()->outer_scope(),
-                                       scope());
-    }
+      scope()->is_arrow_scope()) {
     RewriteParameterInitializerScope(parser_->stack_limit(), initializer,
                                      scope()->outer_scope(), scope());
   }