Change MISSING_VIA_HEADER_4XX bypasses to only last 1 second.

components/data_reduction_proxy/browser/data_reduction_proxy_protocol_unittest.cc

 // 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 "components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h"
 
 #include <utility>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 547 matching lines @@
     { "GET",
       "HTTP/1.1 503 Internal Server Error\r\n"
       "Server: proxy\r\n"
       "Via: 1.1 Chrome-Compression-Proxy\r\n\r\n",
       true,
       1u,
       true,
       0,
       BYPASS_EVENT_TYPE_STATUS_503_HTTP_SERVICE_UNAVAILABLE
     },
+    // Invalid data reduction proxy 4xx response. Missing Via header.
+    { "GET",
+      "HTTP/1.1 404 Not Found\r\n"
+      "Server: proxy\r\n\r\n",
+      true,
+      1u,
+      true,
+      1,
+      BYPASS_EVENT_TYPE_MISSING_VIA_HEADER_4XX
+    },
     // Invalid data reduction proxy response. Missing Via header.
     { "GET",
       "HTTP/1.1 200 OK\r\n"
       "Server: proxy\r\n\r\n",
       true,
       1u,
       true,
       0,
       BYPASS_EVENT_TYPE_MISSING_VIA_HEADER_OTHER
     },
@@ skipping 369 matching lines @@
                         &other_proxy_info);
   EXPECT_FALSE(other_proxy_info.is_direct());
 
   OnResolveProxyHandler(url, load_flags, data_reduction_proxy_config,
                         empty_proxy_retry_info, &test_params,
                         &data_reduction_proxy_info);
   EXPECT_TRUE(data_reduction_proxy_info.is_direct());
 }
 
 }  // namespace data_reduction_proxy