Add histograms for observing UMA throttling effect.

components/metrics/net/net_metrics_log_uploader.cc

Index: components/metrics/net/net_metrics_log_uploader.cc
diff --git a/components/metrics/net/net_metrics_log_uploader.cc b/components/metrics/net/net_metrics_log_uploader.cc
index 0ded667b78783bc71a0deb3ec851db8a53faf4cc..7f76da2c082fea619d6eee4ad333abd614996bf2 100644
--- a/components/metrics/net/net_metrics_log_uploader.cc
+++ b/components/metrics/net/net_metrics_log_uploader.cc
@@ -7,23 +7,9 @@
 #include "base/metrics/histogram_macros.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "net/base/load_flags.h"
-#include "net/base/network_change_notifier.h"
 #include "net/url_request/url_fetcher.h"
 #include "url/gurl.h"
 
-namespace {
-
-// Records the network connection type if upload was successful.
-void RecordConnectionType(int response_code) {
-  if (response_code == 200) {
-    UMA_HISTOGRAM_ENUMERATION("UMA.LogUpload.ConnetionType",
-                              net::NetworkChangeNotifier::GetConnectionType(),
-                              net::NetworkChangeNotifier::CONNECTION_LAST);
-  }
-}
-
-}  // namespace
-
 namespace metrics {
 
 NetMetricsLogUploader::NetMetricsLogUploader(
@@ -70,7 +56,6 @@ void NetMetricsLogUploader::OnURLFetchComplete(const net::URLFetcher* source) {
   if (response_code == net::URLFetcher::RESPONSE_CODE_INVALID)
     response_code = -1;
   current_fetch_.reset();
-  RecordConnectionType(response_code);
   on_upload_complete_.Run(response_code);
 }