Make sure that HttpRequestHeaders contains valid key-value pairs.

chrome/browser/extensions/api/web_request/web_request_api_helpers.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/web_request/web_request_api_helpers.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 1224 matching lines @@
   content::BrowserContext* browser_context = profile;
   for (content::RenderProcessHost::iterator it =
            content::RenderProcessHost::AllHostsIterator();
        !it.IsAtEnd(); it.Advance()) {
     content::RenderProcessHost* host = it.GetCurrentValue();
     if (host->GetBrowserContext() == browser_context)
       SendExtensionWebRequestStatusToHost(host);
   }
 }
 
-bool IsValidHeaderName(const std::string& name) {
-  // Check whether the header name is RFC 2616-compliant.
-  return net::HttpUtil::IsToken(name);
-}
-
-bool IsValidHeaderValue(const std::string& value) {
-  // Just a sanity check: disallow NUL and CRLF.
-  return value.find('\0') == std::string::npos &&
-      value.find("\r\n") == std::string::npos;
-}
-
 }  // namespace extension_web_request_api_helpers