ParserBase: Simplify FuncNameInferrer handling.

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index a8db6fedc6515f05319e352502bdacc817c8c1b6..76868e8a5d75414db77f5e98076d9c1710e44fad 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -906,29 +906,10 @@ class PreParser : public ParserBase<PreParser> {
 
   // Functions for encapsulating the differences between parsing and preparsing;
   // operations interleaved with the recursive descent.
-  V8_INLINE static void PushLiteralName(FuncNameInferrer* fni,
-                                        PreParserIdentifier id) {
-    // PreParser should not use FuncNameInferrer.
-    UNREACHABLE();
-  }
-
-  V8_INLINE static void PushVariableName(FuncNameInferrer* fni,
-                                         PreParserIdentifier id) {
-    // PreParser should not use FuncNameInferrer.
-    UNREACHABLE();
-  }
-
-  V8_INLINE void PushPropertyName(FuncNameInferrer* fni,
-                                  PreParserExpression expression) {
-    // PreParser should not use FuncNameInferrer.
-    UNREACHABLE();
-  }
-
-  V8_INLINE static void InferFunctionName(FuncNameInferrer* fni,
-                                          PreParserExpression expression) {
-    // PreParser should not use FuncNameInferrer.
-    UNREACHABLE();
-  }
+  V8_INLINE static void PushLiteralName(PreParserIdentifier id) {}
+  V8_INLINE static void PushVariableName(PreParserIdentifier id) {}
+  V8_INLINE void PushPropertyName(PreParserExpression expression) {}
+  V8_INLINE static void InferFunctionName(PreParserExpression expression) {}
 
   V8_INLINE static void CheckAssigningFunctionLiteralToProperty(
       PreParserExpression left, PreParserExpression right) {}