Fetch API: Stop lowercasing header names.

third_party/WebKit/Source/modules/fetch/FetchHeaderList.h

Index: third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
diff --git a/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h b/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
index bfe552f483edeb89a46e88b229c023bc1febd9a4..90604231b6e3ed59d0794051d8bba46a02bcd994 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
+++ b/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
@@ -5,13 +5,12 @@
 #ifndef FetchHeaderList_h
 #define FetchHeaderList_h
 
+#include <map>
+#include <utility>
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
-#include <memory>
-#include <utility>
 
 namespace blink {
 
@@ -21,6 +20,12 @@ class Header;
 class MODULES_EXPORT FetchHeaderList final
     : public GarbageCollectedFinalized<FetchHeaderList> {
  public:
+  struct ByteCaseInsensitiveCompare {
+    bool operator()(const String& lhs, const String& rhs) const {
+      return codePointCompareLessThan(lhs.upperASCII(), rhs.upperASCII());
+    }
+  };
+
   typedef std::pair<String, String> Header;
   static FetchHeaderList* create();
   FetchHeaderList* clone() const;
@@ -39,11 +44,11 @@ class MODULES_EXPORT FetchHeaderList final
   void clearList();
 
   bool containsNonSimpleHeader() const;
-  void sortAndCombine();
+  Vector<Header> sortAndCombine() const;
 
-  const Vector<std::unique_ptr<Header>>& list() const { return m_headerList; }
-  const Header& entry(size_t index) const {
-    return *(m_headerList[index].get());
+  const std::multimap<String, String, ByteCaseInsensitiveCompare>& list()
+      const {
+    return m_headerList;
   }
 
   static bool isValidHeaderName(const String&);
@@ -53,7 +58,7 @@ class MODULES_EXPORT FetchHeaderList final
 
  private:
   FetchHeaderList();
-  Vector<std::unique_ptr<Header>> m_headerList;
+  std::multimap<String, String, ByteCaseInsensitiveCompare> m_headerList;
 };
 
 }  // namespace blink