Revert "stats: migrate to Timestamp"

This reverts commit 2235776597e2f47ec353ac911428eb9a54d64a10.

Reason for revert: Breaks compile.

RTCStatsReport::Create(timestamp) needs default value.

Original change's description:
> stats: migrate to Timestamp
>
> BUG=webrtc:13756
>
> Change-Id: I04ba57f9c2ca5a974a406814023911b4eb2d6d38
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/273942
> Commit-Queue: Philipp Hancke <phancke@microsoft.com>
> Reviewed-by: Henrik Boström <hbos@webrtc.org>
> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#38365}

Bug: webrtc:13756
Change-Id: I7eba2bb510af73be50397bd92f730bc6de1ce676
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/279044
Auto-Submit: Mirko Bonadei <mbonadei@webrtc.org>
Owners-Override: Mirko Bonadei <mbonadei@webrtc.org>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38369}

1 files changed, 5 insertions, 14 deletions

diff --git a/stats/rtc_stats_report_unittest.cc b/stats/rtc_stats_report_unittest.cc
index 8af6dbe620..2081364f66 100644
--- a/stats/rtc_stats_report_unittest.cc
+++ b/stats/rtc_stats_report_unittest.cc
@@ -53,10 +53,8 @@ class RTCTestStats3 : public RTCStats {
 WEBRTC_RTCSTATS_IMPL(RTCTestStats3, RTCStats, "test-stats-3", &string)
 
 TEST(RTCStatsReport, AddAndGetStats) {
-  rtc::scoped_refptr<RTCStatsReport> report =
-      RTCStatsReport::Create(Timestamp::Micros(1337));
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(1337);
   EXPECT_EQ(report->timestamp_us(), 1337u);
-  EXPECT_EQ(report->timestamp().us_or(-1), 1337u);
   EXPECT_EQ(report->size(), static_cast<size_t>(0));
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("a0", 1)));
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("a1", 2)));
@@ -89,10 +87,8 @@ TEST(RTCStatsReport, AddAndGetStats) {
 }
 
 TEST(RTCStatsReport, StatsOrder) {
-  rtc::scoped_refptr<RTCStatsReport> report =
-      RTCStatsReport::Create(Timestamp::Micros(1337));
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(1337);
   EXPECT_EQ(report->timestamp_us(), 1337u);
-  EXPECT_EQ(report->timestamp().us_or(-1), 1337u);
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("C", 2)));
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("D", 3)));
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats2("B", 1)));
@@ -109,8 +105,7 @@ TEST(RTCStatsReport, StatsOrder) {
 }
 
 TEST(RTCStatsReport, Take) {
-  rtc::scoped_refptr<RTCStatsReport> report =
-      RTCStatsReport::Create(Timestamp::Zero());
+  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create(0);
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("A", 1)));
   report->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("B", 2)));
   EXPECT_TRUE(report->Get("A"));
@@ -123,17 +118,13 @@ TEST(RTCStatsReport, Take) {
 }
 
 TEST(RTCStatsReport, TakeMembersFrom) {
-  rtc::scoped_refptr<RTCStatsReport> a =
-      RTCStatsReport::Create(Timestamp::Micros(1337));
+  rtc::scoped_refptr<RTCStatsReport> a = RTCStatsReport::Create(1337);
   EXPECT_EQ(a->timestamp_us(), 1337u);
-  EXPECT_EQ(a->timestamp().us_or(-1), 1337u);
   a->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("B", 1)));
   a->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("C", 2)));
   a->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("E", 4)));
-  rtc::scoped_refptr<RTCStatsReport> b =
-      RTCStatsReport::Create(Timestamp::Micros(1338));
+  rtc::scoped_refptr<RTCStatsReport> b = RTCStatsReport::Create(1338);
   EXPECT_EQ(b->timestamp_us(), 1338u);
-  EXPECT_EQ(b->timestamp().us_or(-1), 1338u);
   b->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("A", 0)));
   b->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("D", 3)));
   b->AddStats(std::unique_ptr<RTCStats>(new RTCTestStats1("F", 5)));