Remove use of void** from HttpResponseHeaders::EnumerateHeaderLines

extensions/browser/api/web_request/web_request_api_helpers.cc

Index: extensions/browser/api/web_request/web_request_api_helpers.cc
diff --git a/extensions/browser/api/web_request/web_request_api_helpers.cc b/extensions/browser/api/web_request/web_request_api_helpers.cc
index 6f86bf43943515ad524872c9bac3dca439769263..6af52e04886d69bb2273c00436dd5d8668ddd8fc 100644
--- a/extensions/browser/api/web_request/web_request_api_helpers.cc
+++ b/extensions/browser/api/web_request/web_request_api_helpers.cc
@@ -378,10 +378,10 @@ EventResponseDelta* CalculateOnHeadersReceivedDelta(
 
   // 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)) {
+    while (old_response_headers->EnumerateHeaderLines(iter, &name, &value)) {
       std::string name_lowercase = base::ToLowerASCII(name);
 
       bool header_found = false;
@@ -401,11 +401,11 @@ EventResponseDelta* CalculateOnHeadersReceivedDelta(
   {
     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)) {
+      while (old_response_headers->EnumerateHeaderLines(iter, &name, &value)) {
         if (base::LowerCaseEqualsASCII(name, name_lowercase) &&
             value == i.second) {
           header_found = true;