Adding a missing comma between "counterMaps" and "document".

tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp

 // Copyright 2015 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.
 //
 // Changes Blink-style names to Chrome-style names. Currently transforms:
 //   fields:
 //     int m_operationCount => int operation_count_
 //   variables (including parameters):
 //     int mySuperVariable => int my_super_variable
 //   constants:
@@ skipping 650 matching lines @@
                                               "animationWorklet",
                                               "attrNodeList",
                                               "audioWorklet",
                                               "binaryType",
                                               "blob",
                                               "channelCountMode",
                                               "color",
                                               "compositorElementId",
                                               "constructionStack",
                                               "counterDirectives",
-                                              "counterMaps"
+                                              "counterMaps",
                                               "document",
                                               "dragOperation",
                                               "element",
                                               "emptyChromeClient",
                                               "emptyEditorClient",
                                               "emptySpellCheckerClient",
                                               "entryType",
                                               "error",
                                               "eventTargetDataMap",
                                               "fileUtilities",
@@ skipping 1261 matching lines @@
   for (const auto& r : replacements) {
     std::string replacement_text = r.getReplacementText().str();
     std::replace(replacement_text.begin(), replacement_text.end(), '\n', '\0');
     llvm::outs() << "r:::" << r.getFilePath() << ":::" << r.getOffset()
                  << ":::" << r.getLength() << ":::" << replacement_text << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }