[parser] Remove ParseInfo::closure field.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 548c1093d739ac097e16719d9e8e1af2d8de7c36..8310ad948c543de2cfa10689062e10e1a1106496 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -39,7 +39,6 @@ ScriptData::ScriptData(const byte* data, int length)
   }
 }
 
-
 ParseInfo::ParseInfo(Zone* zone)
     : zone_(zone),
       flags_(0),
@@ -51,15 +50,14 @@ ParseInfo::ParseInfo(Zone* zone)
       unicode_cache_(nullptr),
       stack_limit_(0),
       hash_seed_(0),
+      isolate_(nullptr),
       cached_data_(nullptr),
       ast_value_factory_(nullptr),
       literal_(nullptr),
       scope_(nullptr) {}
 
-
 ParseInfo::ParseInfo(Zone* zone, Handle<JSFunction> function)
     : ParseInfo(zone, Handle<SharedFunctionInfo>(function->shared())) {
-  set_closure(function);
   set_context(Handle<Context>(function->context()));
 }
 
@@ -1048,12 +1046,12 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info,
     // Parse the function literal.
     Scope* scope = NewScope(scope_, SCRIPT_SCOPE);
     info->set_script_scope(scope);
-    if (!info->closure().is_null()) {
+    if (!info->context().is_null()) {
       // Ok to use Isolate here, since lazy function parsing is only done in the
       // main thread.
       DCHECK(parsing_on_main_thread_);
-      scope = Scope::DeserializeScopeChain(isolate, zone(),
-                                           info->closure()->context(), scope);
+      scope = Scope::DeserializeScopeChain(isolate, zone(), *info->context(),
+                                           scope);
     }
     original_scope_ = scope;
     AstNodeFactory function_factory(ast_value_factory());