Update from https://crrev.com/303153

net/http/http_util.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.
 
 // The rules for parsing content-types were borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_util.h"
 
 #include <algorithm>
@@ skipping 257 matching lines @@
 
     // Do a final check on the HttpByteRange object.
     if (!range.IsValid())
       return false;
     ranges->push_back(range);
   }
   return !ranges->empty();
 }
 
 // static
+bool HttpUtil::ParseRetryAfterHeader(const std::string& retry_after_string,
+                                     base::Time now,
+                                     base::TimeDelta* retry_after) {
+  int seconds;
+  base::Time time;
+  base::TimeDelta interval;
+
+  if (base::StringToInt(retry_after_string, &seconds)) {
+    interval = base::TimeDelta::FromSeconds(seconds);
+  } else if (base::Time::FromUTCString(retry_after_string.c_str(), &time)) {
+    interval = time - now;
+  } else {
+    return false;
+  }
+
+  if (interval < base::TimeDelta::FromSeconds(0))
+    return false;
+
+  *retry_after = interval;
+  return true;
+}
+
+// static
 bool HttpUtil::HasHeader(const std::string& headers, const char* name) {
   size_t name_len = strlen(name);
   std::string::const_iterator it =
       std::search(headers.begin(),
                   headers.end(),
                   name,
                   name + name_len,
                   base::CaseInsensitiveCompareASCII<char>());
   if (it == headers.end())
     return false;
@@ skipping 623 matching lines @@
       value_is_quoted_ = true;
       // Do not store iterators into this. See declaration of unquoted_value_.
       unquoted_value_ = HttpUtil::Unquote(value_begin_, value_end_);
     }
   }
 
   return true;
 }
 
 }  // namespace net