Remove unused code for IsFutureStrictReserved.

src/parsing/scanner.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_PARSING_SCANNER_H_
 #define V8_PARSING_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 310 matching lines @@
     return tmp;
   }
 
   Handle<String> SourceMappingUrl(Isolate* isolate) const {
     Handle<String> tmp;
     if (source_mapping_url_.length() > 0)
       tmp = source_mapping_url_.Internalize(isolate);
     return tmp;
   }
 
-  bool IdentifierIsFutureStrictReserved(const AstRawString* string) const;
-
   bool FoundHtmlComment() const { return found_html_comment_; }
 
  private:
   // Scoped helper for literal recording. Automatically drops the literal
   // if aborting the scanning before it's complete.
   class LiteralScope {
    public:
     explicit LiteralScope(Scanner* self) : scanner_(self), complete_(false) {
       scanner_->StartLiteral();
     }
@@ skipping 462 matching lines @@
   bool found_html_comment_;
 
   MessageTemplate::Template scanner_error_;
   Location scanner_error_location_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_SCANNER_H_