Enable cpplint for webrtc/modules/bitrate_controller and fix all uncovered cpplint errors.

webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc

Index: webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc
diff --git a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc
index 1fb4e5682560c3eabae45e07907e22424f814665..bdd980db4376bba3357e7f036efb13c66ce7f803 100644
--- a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc
+++ b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.cc
@@ -10,6 +10,7 @@
 
 #include "webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h"
 
+#include <algorithm>
 #include <cmath>
 
 #include "webrtc/base/checks.h"
@@ -41,7 +42,7 @@ const UmaRampUpMetric kUmaRampupMetrics[] = {
 const size_t kNumUmaRampupMetrics =
     sizeof(kUmaRampupMetrics) / sizeof(kUmaRampupMetrics[0]);
 
-}
+}  // namespace
 
 SendSideBandwidthEstimation::SendSideBandwidthEstimation()
     : lost_packets_since_last_loss_update_Q8_(0),