Update from https://crrev.com/304121

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 <memory>
@@ skipping 178 matching lines @@
 
   // 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. Ideally we'd use the YAML
   // serialization and then use clang-apply-replacements, but that would require
   // copying and pasting a larger amount of boilerplate for all Chrome clang
   // tools.
   llvm::outs() << "==== BEGIN EDITS ====\n";
   for (const auto& r : replacements) {
-    llvm::outs() << "r:" << r.getFilePath() << ":" << r.getOffset() << ":"
-                 << r.getLength() << ":" << r.getReplacementText() << "\n";
+    llvm::outs() << "r:::" << r.getFilePath() << ":::" << r.getOffset() << ":::"
+                 << r.getLength() << ":::" << r.getReplacementText() << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }