Remove static locals from histograms.

webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h

Index: webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
diff --git a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
index 9529068e4ffd5db455e54783b058c43d42e30ad6..5b01ad3608fc967c924cdaa7da8a92672f3f741a 100644
--- a/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
+++ b/webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h
@@ -17,6 +17,7 @@
 #include <utility>
 #include <vector>
 
+#include "webrtc/base/histogram.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
@@ -55,6 +56,11 @@ class SendSideBandwidthEstimation {
   int GetMinBitrate() const;
 
  private:
+  struct UmaRampUpMetric {
+    rtc::Histogram histogram;
+    int bitrate_kbps;
+  };
+
   enum UmaState { kNoUpdate, kFirstDone, kDone };
 
   bool IsInStartPhase(int64_t now_ms) const;
@@ -72,6 +78,15 @@ class SendSideBandwidthEstimation {
 
   std::deque<std::pair<int64_t, uint32_t> > min_bitrate_history_;
 
+  // Note that these should be considered const on construction but are not
+  // marked as such because bandwidth_estimation_ is copy assigned in
+  // bitrate_controller_impl.cc.
+  UmaRampUpMetric rampup_histograms_[3];
+  rtc::Histogram initially_lost_packets_histogram_;
+  rtc::Histogram initial_rtt_histogram_;
+  rtc::Histogram initial_bwe_histogram_;
+  rtc::Histogram initial_vs_converged_diff_histogram_;
+
   // incoming filters
   int lost_packets_since_last_loss_update_Q8_;
   int expected_packets_since_last_loss_update_;