Revert "Piping audio interruption metrics to API layer"

This reverts commit 299c4e68461f1c4428b2a919913b161115025dff.

Reason for revert: https://ci.chromium.org/p/chromium/builders/webrtc.fyi/WebRTC%20Chromium%20FYI%20Win10%20Tester/2753

../../chrome/browser/media/webrtc/webrtc_browsertest_base.cc(539): error: Expected equality of these values:
  "ok-got-stats"
  ExecuteJavascript("verifyLegacyStatsGenerated()", tab)
    Which is: "Test failed: Error: \"googInterruptionCount\" is not a whitelisted stat. Exposing new metrics in the legacy getStats() API is not allowed. Please follow the standardization process: https://docs.google.com/document/d/1q1CJVUqJ6YW9NNRc0tENkLNny8AHrKZfqjy3SL89zjc/edit?usp=sharing\n    at failTest (http://127.0.0.1:50650/webrtc/test_functions.js:46:15)\n    at http://127.0.0.1:50650/webrtc/peerconnection.js:481:19"
With diff:
@@ -1,1 +1,3 @@
-ok-got-stats
+Test failed: Error: \"googInterruptionCount\" is not a whitelisted stat. Exposing new metrics in the legacy getStats() API is not allowed. Please follow the standardization process: https://docs.google.com/document/d/1q1CJVUqJ6YW9NNRc0tENkLNny8AHrKZfqjy3SL89zjc/edit?usp=sharing
+    at failTest (http://127.0.0.1:50650/webrtc/test_functions.js:46:15)
+    at http://127.0.0.1:50650/webrtc/peerconnection.js:481:19

Original change's description:
> Piping audio interruption metrics to API layer
>
> Bug: webrtc:10549
> Change-Id: Ie6abe5819c5b73dc5f5f89bdc375bad77f44ce97
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/134303
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
> Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#27788}

TBR=henrik.lundin@webrtc.org,kwiberg@webrtc.org,ivoc@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:10549
Change-Id: I345306ba9758c0a3b1597724fa860d3e3fdb8995
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/134464
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27802}
diff --git a/modules/audio_coding/neteq/neteq_impl_unittest.cc b/modules/audio_coding/neteq/neteq_impl_unittest.cc
index 8269526..025ed69 100644
--- a/modules/audio_coding/neteq/neteq_impl_unittest.cc
+++ b/modules/audio_coding/neteq/neteq_impl_unittest.cc
@@ -745,7 +745,7 @@
   }
 
   auto lifetime_stats = neteq_->GetLifetimeStatistics();
-  EXPECT_EQ(0, lifetime_stats.interruption_count);
+  EXPECT_EQ(0u, lifetime_stats.interruption_count);
 }
 
 // This test verifies that NetEq can handle comfort noise and enters/quits codec