Simplify the Scope API.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index e2f8da650de94742acb39f1259f8b03dba3b66d0..fc44741914b642a5988baa81b664d38f84dce572 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -1310,7 +1310,7 @@ VariableProxy* Parser::Declare(Handle<String> name,
     var = top_scope_->LocalLookup(name);
     if (var == NULL) {
       // Declare the name.
-      var = top_scope_->DeclareLocal(name, mode, Scope::VAR_OR_CONST);
+      var = top_scope_->DeclareLocal(name, mode);
     } else {
       // The name was declared before; check for conflicting
       // re-declarations. If the previous declaration was a const or the
@@ -3573,10 +3573,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name,
         reserved_loc = scanner().location();
       }
 
-      Variable* parameter = top_scope_->DeclareLocal(param_name,
-                                                     Variable::VAR,
-                                                     Scope::PARAMETER);
-      top_scope_->AddParameter(parameter);
+      top_scope_->DeclareParameter(param_name);
       num_parameters++;
       if (num_parameters > kMaxNumFunctionParameters) {
         ReportMessageAt(scanner().location(), "too_many_parameters",