mac: Prepare for -Wunused-functions.

tools/gn/parser.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/parser.h"
 
 #include "base/logging.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/operators.h"
 #include "tools/gn/token.h"
 
 // grammar:
 //
 // file       := (statement)*
 // statement  := block | if | assignment
 // block      := '{' statement* '}'
 // if         := 'if' '(' expr ')' statement [ else ]
 // else       := 'else' (if | statement)*
 // assignment := ident {'=' | '+=' | '-='} expr
 
-namespace {
-
-// Returns true if the two tokens are on the same line. We assume they're in
-// the same file.
-bool IsSameLine(const Token& a, const Token& b) {
-  DCHECK(a.location().file() == b.location().file());
-  return a.location().line_number() == b.location().line_number();
-}
-
-}  // namespace
-
 enum Precedence {
   PRECEDENCE_ASSIGNMENT = 1,
   PRECEDENCE_OR = 2,
   PRECEDENCE_AND = 3,
   PRECEDENCE_EQUALITY = 4,
   PRECEDENCE_RELATION = 5,
   PRECEDENCE_SUM = 6,
   PRECEDENCE_PREFIX = 7,
   PRECEDENCE_CALL = 8,
 };
@@ skipping 388 matching lines @@
   if (IsAssignment(condition->condition()))
     *err_ = Err(condition->condition(), "Assignment not allowed in 'if'.");
   Consume(Token::RIGHT_PAREN, "Expected ')' after condition of 'if'.");
   condition->set_if_true(ParseBlock().Pass());
   if (Match(Token::ELSE))
     condition->set_if_false(ParseStatement().Pass());
   if (has_error())
     return scoped_ptr<ParseNode>();
   return condition.PassAs<ParseNode>();
 }