--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -178,17 +178,17 @@ ParserSharedBase::~ParserSharedBase() {
 }
 
 ParserBase::ParserBase(JSContext* cx, LifoAlloc& alloc,
                        const ReadOnlyCompileOptions& options,
                        bool foldConstants, UsedNameTracker& usedNames,
                        ScriptSourceObject* sourceObject, ParseGoal parseGoal)
     : ParserSharedBase(cx, alloc, usedNames, sourceObject,
                        ParserSharedBase::Kind::Parser),
-      anyChars(cx, options, thisForCtor()),
+      anyChars(cx, options, this),
       ss(nullptr),
       foldConstants_(foldConstants),
 #ifdef DEBUG
       checkOptionsCalled_(false),
 #endif
       isUnexpectedEOF_(false),
       awaitHandling_(AwaitIsName),
       inParametersOfAsyncFunction_(false),

--- a/js/src/frontend/Parser.h
+++ b/js/src/frontend/Parser.h
@@ -289,19 +289,16 @@ class MOZ_STACK_CLASS ParserSharedBase :
   // Create a new BigInt and store it into the trace list.
   BigIntBox* newBigIntBox(BigInt* val);
 };
 
 class MOZ_STACK_CLASS ParserBase : public ParserSharedBase,
                                    public ErrorReportMixin {
   using Base = ErrorReportMixin;
 
- private:
-  ParserBase* thisForCtor() { return this; }
-
  public:
   TokenStreamAnyChars anyChars;
 
   ScriptSource* ss;
 
   // Perform constant-folding; must be true when interfacing with the emitter.
   const bool foldConstants_ : 1;
 
@@ -1032,18 +1029,16 @@ class MOZ_STACK_CLASS GeneralParser : pu
   MOZ_MUST_USE bool mustMatchToken(TokenKind expected,
                                    ErrorReportT errorReport) {
     return mustMatchTokenInternal(
         [expected](TokenKind actual) { return actual == expected; },
         errorReport);
   }
 
  private:
-  GeneralParser* thisForCtor() { return this; }
-
   NameNodeType noSubstitutionUntaggedTemplate();
   ListNodeType templateLiteral(YieldHandling yieldHandling);
   bool taggedTemplate(YieldHandling yieldHandling, ListNodeType tagArgsList,
                       TokenKind tt);
   bool appendToCallSiteObj(CallSiteNodeType callSiteObj);
   bool addExprAndGetNextTemplStrToken(YieldHandling yieldHandling,
                                       ListNodeType nodeList, TokenKind* ttp);