Store Proxy Servers as proxy servers and not GURLs.

components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
index 7c1293b431570c4b1d4ebe4b7afbfd7008c57c29..e2d40b57d4372b1691094d6aa3b32e33573de849 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
@@ -249,11 +249,12 @@ void DataReductionProxyUsageStats::RecordBypassedBytesHistograms(
                         content_length);
 
     // If non-empty, |proxy_server.first| is the proxy that this request used.
-    if (!data_reduction_proxy_type_info.proxy_servers.first.is_empty()) {
+    const net::ProxyServer& first =
+        data_reduction_proxy_type_info.proxy_servers.first;
+    if (first.is_valid() && !first.host_port_pair().IsEmpty()) {
       DataReductionProxyTamperDetection::DetectAndReport(
           request.response_info().headers.get(),
-          data_reduction_proxy_type_info.proxy_servers.first.SchemeIsSecure(),
-          content_length);
+          first.is_https() || first.is_quic(), content_length);
     }
     return;
   }
@@ -268,7 +269,7 @@ void DataReductionProxyUsageStats::RecordBypassedBytesHistograms(
   // Now that the data reduction proxy is a best effort proxy, if the effective
   // proxy configuration resolves to anything other than direct:// for a URL,
   // the data reduction proxy will not be used.
-  DCHECK(data_reduction_proxy_type_info.proxy_servers.first.is_empty());
+  DCHECK(!data_reduction_proxy_type_info.proxy_servers.first.is_valid());
   if (!request.proxy_server().IsEmpty()) {
     RecordBypassedBytes(last_bypass_type_,
                         DataReductionProxyUsageStats::PROXY_OVERRIDDEN,