Removing warning suppression flags from pc/.

Bug: webrtc:9251
Change-Id: Ic12126fc03309448fe71a17e6b65343949496f4f
Reviewed-on: https://webrtc-review.googlesource.com/86820
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23838}
diff --git a/pc/rtcstats_integrationtest.cc b/pc/rtcstats_integrationtest.cc
index f0c1831..355d1f7a8 100644
--- a/pc/rtcstats_integrationtest.cc
+++ b/pc/rtcstats_integrationtest.cc
@@ -343,7 +343,7 @@
     bool verify_successful = true;
     std::vector<const RTCTransportStats*> transport_stats =
         report_->GetStatsOfType<RTCTransportStats>();
-    EXPECT_EQ(transport_stats.size(), 1);
+    EXPECT_EQ(transport_stats.size(), 1U);
     std::string selected_candidate_pair_id =
         *transport_stats[0]->selected_candidate_pair_id;
     for (const RTCStats& stats : *report_) {