Reland "Add base::TimeDelta::Max()" again.

net/http/http_response_headers.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 header parsing were borrowed from Firefox:
 // http://lxr.mozilla.org/seamonkey/source/netwerk/protocol/http/src/nsHttpResponseHead.cpp
 // The rules for parsing content-types were also borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_response_headers.h"
@@ skipping 991 matching lines @@
     Time last_modified_value;
     if (GetLastModifiedValue(&last_modified_value)) {
       // The last-modified value can be a date in the past!
       if (last_modified_value <= date_value)
         return (date_value - last_modified_value) / 10;
     }
   }
 
   // These responses are implicitly fresh (unless otherwise overruled):
   if (response_code_ == 300 || response_code_ == 301 || response_code_ == 410)
-    return TimeDelta::FromMicroseconds(kint64max);
+    return TimeDelta::Max();
 
   return TimeDelta();  // not fresh
 }
 
 // From RFC 2616 section 13.2.3:
 //
 // Summary of age calculation algorithm, when a cache receives a response:
 //
 //   /*
 //    * age_value
@@ skipping 417 matching lines @@
   iter = NULL;
   while (EnumerateHeader(&iter, "via", &value))
     if (value == kDeprecatedChromeProxyViaValue)
       return true;
 
   return false;
 }
 #endif  // defined(SPDY_PROXY_AUTH_ORIGIN)
 
 }  // namespace net