Remove use of void** from HttpResponseHeaders::EnumerateHeaderLines

extensions/browser/api/web_request/web_request_api_helpers.cc

 // Copyright (c) 2012 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 "extensions/browser/api/web_request/web_request_api_helpers.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 360 matching lines @@
   EventResponseDelta* result =
       new EventResponseDelta(extension_id, extension_install_time);
   result->cancel = cancel;
   result->new_url = new_url;
 
   if (!new_response_headers)
     return result;
 
   // Find deleted headers (header keys are treated case insensitively).
   {
-    void* iter = NULL;
+    size_t iter = 0;
     std::string name;
     std::string value;
     while (old_response_headers->EnumerateHeaderLines(&iter, &name, &value)) {
       std::string name_lowercase = base::ToLowerASCII(name);
 
       bool header_found = false;
       for (const auto& i : *new_response_headers) {
         if (base::LowerCaseEqualsASCII(i.first, name_lowercase) &&
             value == i.second) {
           header_found = true;
           break;
         }
       }
       if (!header_found)
         result->deleted_response_headers.push_back(ResponseHeader(name, value));
     }
   }
 
   // Find added headers (header keys are treated case insensitively).
   {
     for (const auto& i : *new_response_headers) {
       std::string name_lowercase = base::ToLowerASCII(i.first);
-      void* iter = nullptr;
+      size_t iter = 0;
       std::string name;
       std::string value;
       bool header_found = false;
       while (old_response_headers->EnumerateHeaderLines(&iter, &name, &value)) {
         if (base::LowerCaseEqualsASCII(name, name_lowercase) &&
             value == i.second) {
           header_found = true;
           break;
         }
       }
@@ skipping 898 matching lines @@
       std::find(kResourceTypeStrings,
                 kResourceTypeStrings + kResourceTypeStringsLength,
                 type_str);
   if (iter == (kResourceTypeStrings + kResourceTypeStringsLength))
     return false;
   *type = kResourceTypeValues[iter - kResourceTypeStrings];
   return true;
 }
 
 }  // namespace extension_web_request_api_helpers