[presubmit] Enabling readability/inheritance linter checking.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 35a6f3af20bdc7022e7ff5ac065b132533afe4c6..62ff59bfeee124080b7ebd6321fbc838f5caee2b 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -1033,7 +1033,7 @@ class Parser : public ParserBase<ParserTraits> {
     // Visiting functions for AST nodes make this an AstVisitor.
     AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
-    virtual void Visit(AstNode* node) override;
+    void Visit(AstNode* node) override;
 
     void RecurseIntoSubpattern(AstNode* pattern, Expression* value) {
       Expression* old_value = current_value_;