[parser] Clean up (pre)parser traits, part 4

src/parsing/preparser.cc

Index: src/parsing/preparser.cc
diff --git a/src/parsing/preparser.cc b/src/parsing/preparser.cc
index 9fa94a362e4085e10b3eba3ef77de059af11b500..461e853bbc7dbc869fb2f79da36d9784199bafa6 100644
--- a/src/parsing/preparser.cc
+++ b/src/parsing/preparser.cc
@@ -41,9 +41,8 @@ namespace internal {
 #define DUMMY )  // to make indentation work
 #undef DUMMY
 
-PreParserIdentifier ParserBaseTraits<PreParser>::GetSymbol(
-    Scanner* scanner) const {
-  switch (scanner->current_token()) {
+PreParserIdentifier PreParser::GetSymbol() const {
+  switch (scanner()->current_token()) {
     case Token::ENUM:
       return PreParserIdentifier::Enum();
     case Token::AWAIT:
@@ -59,28 +58,20 @@ PreParserIdentifier ParserBaseTraits<PreParser>::GetSymbol(
     case Token::ASYNC:
       return PreParserIdentifier::Async();
     default:
-      if (scanner->UnescapedLiteralMatches("eval", 4))
+      if (scanner()->UnescapedLiteralMatches("eval", 4))
         return PreParserIdentifier::Eval();
-      if (scanner->UnescapedLiteralMatches("arguments", 9))
+      if (scanner()->UnescapedLiteralMatches("arguments", 9))
         return PreParserIdentifier::Arguments();
-      if (scanner->UnescapedLiteralMatches("undefined", 9))
+      if (scanner()->UnescapedLiteralMatches("undefined", 9))
         return PreParserIdentifier::Undefined();
-      if (scanner->LiteralMatches("prototype", 9))
+      if (scanner()->LiteralMatches("prototype", 9))
         return PreParserIdentifier::Prototype();
-      if (scanner->LiteralMatches("constructor", 11))
+      if (scanner()->LiteralMatches("constructor", 11))
         return PreParserIdentifier::Constructor();
       return PreParserIdentifier::Default();
   }
 }
 
-PreParserExpression ParserBaseTraits<PreParser>::ExpressionFromString(
-    int pos, Scanner* scanner, PreParserFactory* factory) const {
-  if (scanner->UnescapedLiteralMatches("use strict", 10)) {
-    return PreParserExpression::UseStrictStringLiteral();
-  }
-  return PreParserExpression::StringLiteral();
-}
-
 PreParser::PreParseResult PreParser::PreParseLazyFunction(
     LanguageMode language_mode, FunctionKind kind, bool has_simple_parameters,
     bool parsing_module, ParserRecorder* log, Scanner::BookmarkScope* bookmark,