Adds UMA to measure when the data reduction proxy via header is missing

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 42b7463c0cfd528433de1873ef389e1f186f6a0d..8c3b2256c999b893ac75af3e9ff5d397c0466cea 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -593,10 +593,11 @@ void ChromeNetworkDelegate::OnCompleted(net::URLRequest* request,
       RecordContentLengthHistograms(received_content_length,
                                     original_content_length,
                                     freshness_lifetime);
+
       if (data_reduction_proxy_enabled_ &&
           data_reduction_proxy_usage_stats_ &&
           !proxy_config_getter_.is_null()) {
-        data_reduction_proxy_usage_stats_->RecordBypassedBytesHistograms(
+        data_reduction_proxy_usage_stats_->RecordBytesHistograms(
             *request,
             *data_reduction_proxy_enabled_,
             proxy_config_getter_.Run());