Remove C++11 usage from Clang tools.

tools/clang/empty_string/EmptyStringConverter.cpp

 // 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.
 //
 // This implements a Clang tool to convert all instances of std::string("") to
 // std::string(). The latter is more efficient (as std::string doesn't have to
 // take a copy of an empty string) and generates fewer instructions as well. It
 // should be run using the tools/clang/scripts/run_tool.py helper.
 
 #include "clang/ASTMatchers/ASTMatchers.h"
@@ skipping 78 matching lines @@
 
   void SetupMatchers(MatchFinder* match_finder);
 
  private:
   ConstructorCallback constructor_callback_;
   InitializerCallback initializer_callback_;
   TemporaryCallback temporary_callback_;
 };
 
 void EmptyStringConverter::SetupMatchers(MatchFinder* match_finder) {
-  const auto& constructor_call =
+  const clang::ast_matchers::StatementMatcher& constructor_call =
       id("call",
          constructExpr(
              hasDeclaration(methodDecl(ofClass(hasName("std::basic_string")))),
              argumentCountIs(2),
              hasArgument(0, id("literal", stringLiteral())),
              hasArgument(1, defaultArgExpr())));
 
   // Note that expr(has()) in the matcher is significant; the Clang AST wraps
   // calls to the std::string constructor with exprWithCleanups nodes. Without
   // the expr(has()) matcher, the first and last rules would not match anything!
@@ skipping 72 matching lines @@
   int result =
       tool.run(clang::tooling::newFrontendActionFactory(&match_finder));
   if (result != 0)
     return result;
 
   // Each replacement line should have the following format:
   // r:<file path>:<offset>:<length>:<replacement text>
   // Only the <replacement text> field can contain embedded ":" characters.
   // TODO(dcheng): Use a more clever serialization.
   llvm::outs() << "==== BEGIN EDITS ====\n";
-  for (const Replacement& r : replacements) {
-    llvm::outs() << "r:" << r.getFilePath() << ":" << r.getOffset() << ":"
-                 << r.getLength() << ":" << r.getReplacementText() << "\n";
+  for (Replacements::const_iterator it = replacements.begin();
+       it != replacements.end(); ++it) {
+    llvm::outs() << "r:" << it->getFilePath() << ":" << it->getOffset() << ":"
+                 << it->getLength() << ":" << it->getReplacementText() << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }