Remove use of void** from HttpResponseHeaders::EnumerateHeaderLines

mojo/services/network/url_loader_impl.cc

Index: mojo/services/network/url_loader_impl.cc
diff --git a/mojo/services/network/url_loader_impl.cc b/mojo/services/network/url_loader_impl.cc
index bcd73f1fc0b80445e644e8b8cfbd8ac7975ee35f..730dec68398af1ff0aaf4e2bfb68419420082d47 100644
--- a/mojo/services/network/url_loader_impl.cc
+++ b/mojo/services/network/url_loader_impl.cc
@@ -77,9 +77,9 @@ URLResponsePtr MakeURLResponse(const net::URLRequest* url_request) {
 
     response->headers = Array<HttpHeaderPtr>::New(0);
     std::vector<String> header_lines;
-    void* iter = nullptr;
+    size_t iter = 0;
     std::string name, value;
-    while (headers->EnumerateHeaderLines(&iter, &name, &value)) {
+    while (headers->EnumerateHeaderLines(iter, &name, &value)) {
       HttpHeaderPtr header = HttpHeader::New();
       header->name = name;
       header->value = value;