Fetch API: Stop lowercasing header names.

third_party/WebKit/Source/modules/fetch/Request.cpp

Index: third_party/WebKit/Source/modules/fetch/Request.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/Request.cpp b/third_party/WebKit/Source/modules/fetch/Request.cpp
index 46eea38c21112f0118111705f015f9d7e066487e..bfba03bd18bc8b616d510ce5d19ecd0190591802 100644
--- a/third_party/WebKit/Source/modules/fetch/Request.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Request.cpp
@@ -704,8 +704,7 @@ void Request::PopulateWebServiceWorkerRequest(
   web_request.SetURL(url);
 
   const FetchHeaderList* header_list = headers_->HeaderList();
-  for (size_t i = 0, size = header_list->size(); i < size; ++i) {
-    const FetchHeaderList::Header& header = header_list->Entry(i);
+  for (const auto& header : header_list->List()) {
     web_request.AppendHeader(header.first, header.second);
   }