Revert of RTCRtpReceiver.getContributingSources() added.

third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp

Index: third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp b/third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp
index e164e4dbfe4431631389cc426daa94d89f2774eb..27706ff98c69d207d32866163b1c8a7e76277634 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp
@@ -4,8 +4,6 @@
 
 #include "modules/peerconnection/RTCRtpReceiver.h"
 
-#include "bindings/core/v8/Microtask.h"
-#include "public/platform/WebRTCRtpContributingSource.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -22,58 +20,8 @@
   return track_;
 }
 
-const HeapVector<Member<RTCRtpContributingSource>>&
-RTCRtpReceiver::getContributingSources() {
-  UpdateSourcesIfNeeded();
-  return contributing_sources_;
-}
-
-void RTCRtpReceiver::UpdateSourcesIfNeeded() {
-  if (!contributing_sources_needs_updating_)
-    return;
-  contributing_sources_.Clear();
-  for (const std::unique_ptr<WebRTCRtpContributingSource>&
-           web_contributing_source : receiver_->GetSources()) {
-    if (web_contributing_source->SourceType() ==
-        WebRTCRtpContributingSourceType::SSRC) {
-      // TODO(hbos): When |getSynchronizationSources| is added to get SSRC
-      // sources don't ignore SSRCs here.
-      continue;
-    }
-    DCHECK_EQ(web_contributing_source->SourceType(),
-              WebRTCRtpContributingSourceType::CSRC);
-    auto it = contributing_sources_by_source_id_.Find(
-        web_contributing_source->Source());
-    if (it == contributing_sources_by_source_id_.end()) {
-      RTCRtpContributingSource* contributing_source =
-          new RTCRtpContributingSource(this, *web_contributing_source);
-      contributing_sources_by_source_id_.insert(contributing_source->source(),
-                                                contributing_source);
-      contributing_sources_.push_back(contributing_source);
-    } else {
-      it->value->UpdateMembers(*web_contributing_source);
-      contributing_sources_.push_back(it->value);
-    }
-  }
-  // Clear the flag and schedule a microtask to reset it to true. This makes
-  // the cache valid until the next microtask checkpoint. As such, sources
-  // represent a snapshot and can be compared reliably in .js code, no risk of
-  // being updated due to an RTP packet arriving. E.g.
-  // "source.timestamp == source.timestamp" will always be true.
-  contributing_sources_needs_updating_ = false;
-  Microtask::EnqueueMicrotask(
-      WTF::Bind(&RTCRtpReceiver::SetContributingSourcesNeedsUpdating,
-                WrapWeakPersistent(this)));
-}
-
-void RTCRtpReceiver::SetContributingSourcesNeedsUpdating() {
-  contributing_sources_needs_updating_ = true;
-}
-
 DEFINE_TRACE(RTCRtpReceiver) {
   visitor->Trace(track_);
-  visitor->Trace(contributing_sources_by_source_id_);
-  visitor->Trace(contributing_sources_);
 }
 
 }  // namespace blink