Delay generation of User-Agent header to URLRequestHttpJob and accept custom User-Agent from XHR/Fe…

third_party/WebKit/Source/core/fetch/FetchUtils.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/fetch/FetchUtils.h"
 
 #include "platform/HTTPNames.h"
 #include "platform/network/HTTPHeaderMap.h"
 #include "platform/network/HTTPParsers.h"
 #include "wtf/HashSet.h"
@@ skipping 47 matching lines @@
         "dnt",
         "expect",
         "host",
         "keep-alive",
         "origin",
         "referer",
         "te",
         "trailer",
         "transfer-encoding",
         "upgrade",
-        "user-agent",
         "via",
     };
 }
 
 const ForbiddenHeaderNames& ForbiddenHeaderNames::get()
 {
     DEFINE_THREAD_SAFE_STATIC_LOCAL(const ForbiddenHeaderNames, instance, new ForbiddenHeaderNames);
     return instance;
 }
 
@@ skipping 130 matching lines @@
 String FetchUtils::normalizeHeaderValue(const String& value)
 {
     // https://fetch.spec.whatwg.org/#concept-header-value-normalize
     // Strip leading and trailing whitespace from header value.
     // HTTP whitespace bytes are 0x09, 0x0A, 0x0D, and 0x20.
 
     return value.stripWhiteSpace(isHTTPWhitespace);
 }
 
 } // namespace blink