Fetch API: Stop lowercasing header names.

third_party/WebKit/Source/modules/cachestorage/Cache.cpp

Index: third_party/WebKit/Source/modules/cachestorage/Cache.cpp
diff --git a/third_party/WebKit/Source/modules/cachestorage/Cache.cpp b/third_party/WebKit/Source/modules/cachestorage/Cache.cpp
index 174bd4d0684106d2a7583054faffab56eaeda3d3..18c2d0238f64e03651532ba06ad1176c68443086 100644
--- a/third_party/WebKit/Source/modules/cachestorage/Cache.cpp
+++ b/third_party/WebKit/Source/modules/cachestorage/Cache.cpp
@@ -205,9 +205,8 @@ void RecordResponseTypeForAdd(const Member<Response>& response) {
 
 bool VaryHeaderContainsAsterisk(const Response* response) {
   const FetchHeaderList* headers = response->headers()->HeaderList();
-  for (size_t i = 0; i < headers->size(); ++i) {
-    const FetchHeaderList::Header& header = headers->Entry(i);
-    if (header.first == "vary") {
+  for (const auto& header : headers->List()) {
+    if (EqualIgnoringASCIICase(header.first, "vary")) {
       Vector<String> fields;
       header.second.Split(',', fields);
       for (size_t j = 0; j < fields.size(); ++j) {