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 666857c4d2cfa63055052f5c2b60276572164c31..a30443e3e9f4a49f1da5387d72656d6918efbcf8 100644
--- a/third_party/WebKit/Source/modules/fetch/Request.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Request.cpp
@@ -700,8 +700,7 @@ void Request::populateWebServiceWorkerRequest(
   webRequest.setURL(url());
 
   const FetchHeaderList* headerList = m_headers->headerList();
-  for (size_t i = 0, size = headerList->size(); i < size; ++i) {
-    const FetchHeaderList::Header& header = headerList->entry(i);
+  for (const auto& header : headerList->list()) {
     webRequest.appendHeader(header.first, header.second);
   }