chrome/common: Change auto to not deduce raw pointers.

chrome/common/trace_event_args_whitelist.cc

 // 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.
 
 #include "chrome/common/trace_event_args_whitelist.h"
 
 #include "base/bind.h"
 #include "base/strings/pattern.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
@@ skipping 71 matching lines @@
         }
         return true;
       }
     }
   }
 
   return false;
 }
 
 bool IsMetadataWhitelisted(const std::string& metadata_name) {
-  for (auto key : kMetadataWhitelist) {
+  for (auto* key : kMetadataWhitelist) {
     if (base::MatchPattern(metadata_name, key)) {
       return true;
     }
   }
   return false;
 }