Continue to clean c_str() calls.

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 57 matching lines @@
   DCHECK(arg_name_filter);
   base::CStringTokenizer category_group_tokens(
       category_group_name, category_group_name + strlen(category_group_name),
       ",");
   while (category_group_tokens.GetNext()) {
     const std::string& category_group_token = category_group_tokens.token();
     for (int i = 0; kEventArgsWhitelist[i].category_name != nullptr; ++i) {
       const WhitelistEntry& whitelist_entry = kEventArgsWhitelist[i];
       DCHECK(whitelist_entry.event_name);
 
-      if (base::MatchPattern(category_group_token.c_str(),
+      if (base::MatchPattern(category_group_token,
                              whitelist_entry.category_name) &&
           base::MatchPattern(event_name, whitelist_entry.event_name)) {
         if (whitelist_entry.arg_name_filter) {
           *arg_name_filter = base::Bind(&IsTraceArgumentNameWhitelisted,
                                         whitelist_entry.arg_name_filter);
         }
         return true;
       }
     }
   }
 
   return false;
 }
 
 bool IsMetadataWhitelisted(const std::string& metadata_name) {
   for (auto* key : kMetadataWhitelist) {
     if (base::MatchPattern(metadata_name, key)) {
       return true;
     }
   }
   return false;
 }