Switch platform/mediastream/ away from SEQUENCE_CHECKER

... to use THREAD_CHECKER instead.

Blink does not currently make use of sequences.

BUG=787254
R=guidou@chromium.org

Change-Id: Idda5453badb39a2c52ea8c5d8282a338d9cb5d3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946623
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721505}

third_party/blink/renderer/platform/mediastream/webrtc_uma_histograms.cc

@@ -29,7 +29,7 @@ void UpdateWebRTCMethodCount(WebRTCAPIName api_name) {
 }
 
 PerSessionWebRTCAPIMetrics::~PerSessionWebRTCAPIMetrics() {
-  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
 }
 
 // static
@@ -38,12 +38,12 @@ PerSessionWebRTCAPIMetrics* PerSessionWebRTCAPIMetrics::GetInstance() {
 }
 
 void PerSessionWebRTCAPIMetrics::IncrementStreamCounter() {
-  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   ++num_streams_;
 }
 
 void PerSessionWebRTCAPIMetrics::DecrementStreamCounter() {
-  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   if (--num_streams_ == 0) {
     ResetUsage();
   }
@@ -61,7 +61,7 @@ void PerSessionWebRTCAPIMetrics::LogUsage(WebRTCAPIName api_name) {
 }
 
 void PerSessionWebRTCAPIMetrics::LogUsageOnlyOnce(WebRTCAPIName api_name) {
-  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   if (!has_used_api_[static_cast<int>(api_name)]) {
     has_used_api_[static_cast<int>(api_name)] = true;
     LogUsage(api_name);

third_party/blink/renderer/platform/mediastream/webrtc_uma_histograms.h

@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
-#include "base/sequence_checker.h"
+#include "base/threading/thread_checker.h"
 #include "third_party/blink/public/common/mediastream/media_stream_request.h"
 #include "third_party/blink/public/mojom/mediastream/media_stream.mojom-shared.h"
 #include "third_party/blink/public/platform/web_rtc_api_name.h"
@@ -88,7 +88,7 @@ class PLATFORM_EXPORT PerSessionWebRTCAPIMetrics {
   int num_streams_;
   bool has_used_api_[static_cast<int>(WebRTCAPIName::kInvalidName)];
 
-  SEQUENCE_CHECKER(sequence_checker_);
+  THREAD_CHECKER(thread_checker_);
 
   DISALLOW_COPY_AND_ASSIGN(PerSessionWebRTCAPIMetrics);
 };