Deprecate NonThreadSafe in content/renderer/media in favor of SequenceChecker.

content/renderer/media/webrtc_uma_histograms.h

Index: content/renderer/media/webrtc_uma_histograms.h
diff --git a/content/renderer/media/webrtc_uma_histograms.h b/content/renderer/media/webrtc_uma_histograms.h
index e333178d66b58cc28bc2940d6e654e5037da2f17..4b72816e5488eae9e25b2d043936d2831e93f640 100644
--- a/content/renderer/media/webrtc_uma_histograms.h
+++ b/content/renderer/media/webrtc_uma_histograms.h
@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "content/common/content_export.h"
 #include "content/public/common/media_stream_request.h"
 
@@ -66,7 +66,7 @@ void UpdateWebRTCMethodCount(JavaScriptAPIName api_name);
 //
 // The UpdateWebRTCMethodCount function above uses this class to log a
 // metric at most once per session.
-class CONTENT_EXPORT PerSessionWebRTCAPIMetrics : public base::NonThreadSafe {
+class CONTENT_EXPORT PerSessionWebRTCAPIMetrics {
  public:
   virtual ~PerSessionWebRTCAPIMetrics();
 
@@ -98,6 +98,8 @@ class CONTENT_EXPORT PerSessionWebRTCAPIMetrics : public base::NonThreadSafe {
   int num_streams_;
   bool has_used_api_[INVALID_NAME];

[mcasas, 2017/06/02 15:01:13]

<rant mode>
Ugh, this should be s/INVALID_NAME/NUM_APIS/ or some such.
</rant mode>

 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(PerSessionWebRTCAPIMetrics);
 };