Revert^2 "Default enable WebRTC-HeaderExtensionNegotiateMemory" This reverts commit 74d988fd57f8f1b6722d8ac6f49c686b9f2bc196. Reland "Default enable WebRTC-HeaderExtensionNegotiateMemory" This reverts commit 74d988fd57f8f1b6722d8ac6f49c686b9f2bc196. Reason for revert: Added code to skip stopped transceivers Original change's description: > Revert "Default enable WebRTC-HeaderExtensionNegotiateMemory" > > This reverts commit 4ecf297a4c0af68ff8af8c3a8e6b0832bddd14d5. > > Reason for revert: Impacted unexpected application usages > > Original change's description: > > Default enable WebRTC-HeaderExtensionNegotiateMemory > > > > Spec change: https://github.com/w3c/webrtc-extensions/pull/238 > > > > Chromestatus entry for change: https://chromestatus.com/feature/5135528638939136 > > > > Bug: webrtc:439514253 > > Change-Id: I296f2f06dd69b4e30be419b44c926acfd2722e2d > > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/407821 > > Commit-Queue: Harald Alvestrand <hta@webrtc.org> > > Reviewed-by: Guido Urdaneta <guidou@webrtc.org> > > Cr-Commit-Position: refs/heads/main@{#45993} > > Bug: webrtc:439514253, chromium:467164231 > Change-Id: I95dbc8cbaf1b769ffaea291801684bc26e4b9ccb > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/433102 > Reviewed-by: Guido Urdaneta <guidou@webrtc.org> > Commit-Queue: Harald Alvestrand <hta@webrtc.org> > Cr-Commit-Position: refs/heads/main@{#46456} Bug: webrtc:439514253, chromium:467164231 Change-Id: I2df85ba25016374a52abb13037cdca74fb1a395d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/453240 Reviewed-by: Guido Urdaneta <guidou@webrtc.org> Commit-Queue: Guido Urdaneta <guidou@webrtc.org> Cr-Commit-Position: refs/heads/main@{#47038}

diff --git a/pc/rtp_transceiver.cc b/pc/rtp_transceiver.cc
index 77d99a1..0ccad43 100644
--- a/pc/rtp_transceiver.cc
+++ b/pc/rtp_transceiver.cc

@@ -1219,19 +1219,19 @@
   RTC_DCHECK(content);
   if (sdp_type == SdpType::kAnswer || sdp_type == SdpType::kPrAnswer) {
     negotiated_header_extensions_ = content->rtp_header_extensions();
-    if (env_.field_trials().IsEnabled(
+    if (!env_.field_trials().IsDisabled(
             "WebRTC-HeaderExtensionNegotiateMemory")) {
       header_extensions_to_negotiate_ = GetNegotiatedHeaderExtensions();
     }
   } else if (sdp_type == SdpType::kOffer) {
-    if (env_.field_trials().IsEnabled(
+    if (!env_.field_trials().IsDisabled(
             "WebRTC-HeaderExtensionNegotiateMemory")) {
       header_extensions_for_rollback_ = header_extensions_to_negotiate_;
       header_extensions_to_negotiate_ =
           GetOfferedAndImplementedHeaderExtensions(content);
     }
   } else if (sdp_type == SdpType::kRollback) {
-    if (env_.field_trials().IsEnabled(
+    if (!env_.field_trials().IsDisabled(
             "WebRTC-HeaderExtensionNegotiateMemory")) {
       RTC_CHECK(!header_extensions_for_rollback_.empty());
       header_extensions_to_negotiate_ = header_extensions_for_rollback_;

diff --git a/pc/rtp_transmission_manager.cc b/pc/rtp_transmission_manager.cc
index dc6e4bc..b67a3fe 100644
--- a/pc/rtp_transmission_manager.cc
+++ b/pc/rtp_transmission_manager.cc

@@ -284,7 +284,8 @@
   RTC_DCHECK(!FindSenderById(sender_id));
   std::vector<RtpHeaderExtensionCapability> header_extensions =
       std::move(header_extensions_to_negotiate);
-  if (env_.field_trials().IsEnabled("WebRTC-HeaderExtensionNegotiateMemory")) {
+  if (!env_.field_trials().IsDisabled(
+          "WebRTC-HeaderExtensionNegotiateMemory")) {
     // If we have already negotiated header extensions for this type,
     // and it is not stopped,
     // reuse the negotiated state for new transceivers of the same type.