Bug 1551916 - Remove |TokenStreamAnyChars::undoInternalUpdateLineInfoForEOL| as unused. r=arai

Differential Revision: https://phabricator.services.mozilla.com/D31300

--HG--
extra : moz-landing-system : lando

js/src/frontend/TokenStream.cpp

@@ -639,14 +639,6 @@ TokenStreamAnyChars::internalUpdateLineInfoForEOL(uint32_t lineStartOffset) {
   return srcCoords.add(lineno, linebase);
 }
 
-void TokenStreamAnyChars::undoInternalUpdateLineInfoForEOL() {
-  MOZ_ASSERT(prevLinebase !=
-             size_t(-1));  // we should never get more than one EOL
-  linebase = prevLinebase;
-  prevLinebase = size_t(-1);
-  lineno--;
-}
-
 #ifdef DEBUG
 
 template <>

js/src/frontend/TokenStream.h

@@ -636,8 +636,6 @@ class TokenStreamAnyChars : public TokenStreamShared {
   MOZ_MUST_USE MOZ_ALWAYS_INLINE bool internalUpdateLineInfoForEOL(
       uint32_t lineStartOffset);
 
-  void undoInternalUpdateLineInfoForEOL();
-
  public:
   const Token& nextToken() const {
     MOZ_ASSERT(hasLookahead());