Revert "Fix about:webrtc-internals "Stats Tables""

This reverts commit f61878bc.

Reason for revert: [sheriff] it looks very likely that this change caused a crash in WebRTCInternalsIntegrationBrowserTest.IntegrationWithWebRtcEventLogger (https://ci.chromium.org/p/chromium/builders/ci/Mac10.10%20Tests/48280).

Original change's description:
> Fix about:webrtc-internals "Stats Tables"
> 
> This is a fixup CL of [1] spotted and report by hbos@chromium.org
> on [2].
> 
> [1] https://crrev.com/c/1842414 (Onion soup RTCPeerConnectionHandler and its direct dependences)
> [2] https://crrev.com/c/1842414/14#message-daf2b117b98895c3692a635ac873e249e6f905c1
> 
> Basically the original CL was supposed to replace the code
> that used to bound PeerConnectionTracker to its associated
> mojom::Receiver instance in [3] by the corresponding code in
> Blink.
> However, the replacement code got accidentally missing while rebasing
> the CL over and over.
> 
> [3] https://crrev.com/c/1842414/14/content/renderer/render_thread_impl.cc#b777
> 
> This CL amends the original CL with the proper code in
> blink/renderer/modules/modules_initializer.cc@RegisterInterfaces().
> 
> TEST=<out>/browser_tests --gtest_filter=WebRtcInternalsPerfBrowserTest.MANUAL_RunsAudioVideoCall60SecsAndLogsInternalMetricsVp8 \
> --run-manual --ui-test-action-max-timeout=100000 --test-launcher-timeout=100001
> 
> Manual test= Open Chromium load about:webrtc-internals and [4].
> It is expected that WebRTC statistics appear.
> 
> [4] https://codepen.io/anon/pen/JQLEqR?editors=1010
> 
> R=​haraken@chromium.org
> TBR=guidou@chromium.org, hbos@chromium.org
> 
> BUG=787254
> 
> Change-Id: I88f26b8cbcc09b707f6db5c9e7ba40bdbd8e82e8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893293
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Henrik Boström <hbos@chromium.org>
> Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
> Commit-Queue: Henrik Boström <hbos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#711647}

TBR=haraken@chromium.org,hbos@chromium.org,guidou@chromium.org,tonikitoo@igalia.com

Change-Id: If20ddd5622f30af1bfe1a8ca7d3b041b605bc7b2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 787254
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895195Reviewed-by: Armando Miraglia <armax@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711665}

third_party/blink/renderer/modules/modules_initializer.cc

@@ -62,7 +62,6 @@
 #include "third_party/blink/renderer/modules/media_controls/media_controls_impl.h"
 #include "third_party/blink/renderer/modules/mediastream/user_media_client.h"
 #include "third_party/blink/renderer/modules/mediastream/user_media_controller.h"
-#include "third_party/blink/renderer/modules/peerconnection/peer_connection_tracker.h"
 #include "third_party/blink/renderer/modules/picture_in_picture/picture_in_picture_controller_impl.h"
 #include "third_party/blink/renderer/modules/presentation/presentation_controller.h"
 #include "third_party/blink/renderer/modules/presentation/presentation_receiver.h"
@@ -317,11 +316,6 @@ void ModulesInitializer::RegisterInterfaces(
   registry.AddInterface(
       ConvertToBaseCallback(CrossThreadBindRepeating(&WebDatabaseImpl::Create)),
       Platform::Current()->GetIOTaskRunner());
-  registry.AddInterface(
-      ConvertToBaseCallback(CrossThreadBindRepeating(
-          &PeerConnectionTracker::Bind,
-          WTF::CrossThreadUnretained(PeerConnectionTracker::GetInstance()))),
-      Thread::MainThread()->GetTaskRunner());
 }
 
 }  // namespace blink