Better header value parsing for Server-Timing.

third_party/WebKit/Source/platform/network/HTTPParsers.h

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 167 matching lines @@
 // |*instance_length| = size in bytes of the object requested
 // If this method returns false, then all of the outputs will be -1.
 PLATFORM_EXPORT bool ParseContentRangeHeaderFor206(const String& content_range,
                                                    int64_t* first_byte_position,
                                                    int64_t* last_byte_position,
                                                    int64_t* instance_length);
 
 PLATFORM_EXPORT std::unique_ptr<ServerTimingHeaderVector>
 ParseServerTimingHeader(const String&);
 
-PLATFORM_EXPORT String CheckDoubleQuotedString(const String&);
+using Mode = blink::ParsedContentType::Mode;
 
 }  // namespace blink
 
 #endif