Reland: [Parse] ParseInfo owns the parsing Zone.

src/debug/debug-scopes.cc

Index: src/debug/debug-scopes.cc
diff --git a/src/debug/debug-scopes.cc b/src/debug/debug-scopes.cc
index de96034abd8e5dd5b614a7a7470424031454a9bd..a2f6e39b93eaf9432e47a202fcdc49f7c07ee9ee 100644
--- a/src/debug/debug-scopes.cc
+++ b/src/debug/debug-scopes.cc
@@ -86,12 +86,11 @@ ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector,
 
   // Reparse the code and analyze the scopes.
   // Check whether we are in global, eval or function code.
-  Zone zone(isolate->allocator(), ZONE_NAME);
   std::unique_ptr<ParseInfo> info;
   if (scope_info->scope_type() != FUNCTION_SCOPE) {
     // Global or eval code.
     Handle<Script> script(Script::cast(shared_info->script()));
-    info.reset(new ParseInfo(&zone, script));
+    info.reset(new ParseInfo(script));
     if (scope_info->scope_type() == EVAL_SCOPE) {
       info->set_eval();
       if (!function->context()->IsNativeContext()) {
@@ -107,7 +106,7 @@ ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector,
     }
   } else {
     // Inner function.
-    info.reset(new ParseInfo(&zone, shared_info));
+    info.reset(new ParseInfo(shared_info));
   }
   if (parsing::ParseAny(info.get()) && Rewriter::Rewrite(info.get())) {
     DeclarationScope* scope = info->literal()->scope();