Bypass data reduction proxy if no handler is found for a 407 error.

components/data_reduction_proxy/common/data_reduction_proxy_headers.cc

Index: components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
diff --git a/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc b/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
index c7775c81216f46579e772a3b56357031133cef20..521062da91d92febc5af86bcad8236e433376c74 100644
--- a/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
+++ b/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
@@ -121,6 +121,11 @@ GetDataReductionProxyBypassEventType(
     // Fall back if a 500, 502 or 503 is returned.
     return ProxyService::INTERNAL_SERVER_ERROR_BYPASS;
   }
+  std::string dummy;
+  if (headers->response_code() == net::HTTP_PROXY_AUTHENTICATION_REQUIRED
+      && !headers->EnumerateHeader(NULL, "Proxy-Authenticate", &dummy)) {

[bengr, 2014/06/05 17:26:24]

Use headers->HasHeader("Proxy-Authenticate").

[Not at Google. Contact bengr, 2014/06/05 17:51:53]

Done.

+    return ProxyService::PROXY_407_BYPASS;
+  }
   if (!IsDataReductionProxyResponse(headers) &&
       (headers->response_code() != net::HTTP_NOT_MODIFIED)) {
     // A Via header might not be present in a 304. Since the goal of a 304