metrics cleanup and fixes.

src/platform/metrics/metrics_daemon.cc

Index: src/platform/metrics/metrics_daemon.cc
diff --git a/src/platform/metrics/metrics_daemon.cc b/src/platform/metrics/metrics_daemon.cc
index a924b8ab4a9791c5750bc4de688e35f8ce7782b1..9bb9c205f1e8b199762d928e604fa2db479b9143 100644
--- a/src/platform/metrics/metrics_daemon.cc
+++ b/src/platform/metrics/metrics_daemon.cc
@@ -113,12 +113,10 @@ void MetricsDaemon::LogNetworkStateChange(const char* newstate) {
     if (diff.tv_sec >= INT_MAX / 1000) {
       diff_ms = INT_MAX;
     }
-    char buffer[100];
-    snprintf(buffer, sizeof(buffer), "%d", diff_ms);
     if (testing_) {
-      TestPublishMetric(network_states_[old_id].stat_name, buffer);
+      TestPublishMetric(network_states_[old_id].stat_name, diff_ms);
     } else {
-      ChromePublishMetric(network_states_[old_id].stat_name, buffer);
+      ChromePublishMetric(network_states_[old_id].stat_name, diff_ms);
     }
   }
   network_state_id_ = new_id;
@@ -135,10 +133,10 @@ MetricsDaemon::GetNetworkStateId(const char* state_name) {
   return static_cast<NetworkStateId>(-1);
 }
 
-void MetricsDaemon::ChromePublishMetric(const char* name, const char* value) {
+void MetricsDaemon::ChromePublishMetric(const char* name, int value) {
   MetricsLibrary::SendToChrome(name, value);
 }
 
-void MetricsDaemon::TestPublishMetric(const char* name, const char* value) {
+void MetricsDaemon::TestPublishMetric(const char* name, int value) {
   LOG(INFO) << "received metric: " << name << " " << value;
 }