Fix comment - ice transport is cleared on the networking thread.

Bug: chromium:907849
Change-Id: I15afe28d3fb2a175a6e2e7491dc33d36f9f9cd32
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132008
Commit-Queue: Marina Ciocea <marinaciocea@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27509}
diff --git a/pc/ice_transport.cc b/pc/ice_transport.cc
index e395354..ccc5ecd 100644
--- a/pc/ice_transport.cc
+++ b/pc/ice_transport.cc
@@ -16,9 +16,9 @@
 namespace webrtc {
 
 IceTransportWithPointer::~IceTransportWithPointer() {
-  // We depend on the signaling thread to call Clear() before dropping
+  // We depend on the networking thread to call Clear() before dropping
   // its last reference to this object; if the destructor is called
-  // on the signaling thread, it's OK to not have called Clear().
+  // on the networking thread, it's OK to not have called Clear().
   if (internal_) {
     RTC_DCHECK_RUN_ON(creator_thread_);
   }