Delete obsolete RtcEventLogOutputFile constructor

Followup to https://webrtc-review.googlesource.com/c/src/+/134460.

Bug: webrtc:6463
Change-Id: Ib6574b02b21fddc598c1f67c7e2b515f01d33204
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139887
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28206}
diff --git a/pc/peer_connection_interface_unittest.cc b/pc/peer_connection_interface_unittest.cc
index 4549912..2ea3e86 100644
--- a/pc/peer_connection_interface_unittest.cc
+++ b/pc/peer_connection_interface_unittest.cc
@@ -451,6 +451,12 @@
     "inline:NzB4d1BINUAvLEw6UzF3WSJ+PSdFcGdUJShpX1Zj|2^20|1:32 "
     "dummy_session_params\r\n";
 
+class RtcEventLogOutputNull final : public RtcEventLogOutput {
+ public:
+  bool IsActive() const override { return true; }
+  bool Write(const std::string& output) override { return true; }
+};
+
 using ::cricket::StreamParams;
 using ::testing::Exactly;
 using ::testing::Values;
@@ -3453,11 +3459,9 @@
   // The RtcEventLog will be reset when the PeerConnection is closed.
   pc_->Close();
 
-  rtc::PlatformFile file = 0;
-  int64_t max_size_bytes = 1024;
-  EXPECT_FALSE(pc_->StartRtcEventLog(
-      absl::make_unique<webrtc::RtcEventLogOutputFile>(file, max_size_bytes),
-      webrtc::RtcEventLog::kImmediateOutput));
+  EXPECT_FALSE(
+      pc_->StartRtcEventLog(absl::make_unique<webrtc::RtcEventLogOutputNull>(),
+                            webrtc::RtcEventLog::kImmediateOutput));
   pc_->StopRtcEventLog();
 }