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 285a2e31f620f92b7a0e0c2c1cb236c792be813a..1c80fea60a1f857d206f026e4aafda8a44989228 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -586,10 +586,11 @@ 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());