Revert "Fix ClusterFuzz NPD"

This reverts commit 82e54baf.

Reason for revert: Fix not landed in time.

Original change's description:
> Fix ClusterFuzz NPD
>
> playerIDs were getting added to dead players, then removed from the
> player map - when it came time to delete players, the dead players
> tried to be removed again. Looks like CF was running without DCHECK
> enabled, so it never hit the check for iter != players_.end().
>
> Bug: 1148757
> Change-Id: I13486c59ec362b023ddbf93462d359bec7707512
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537789
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827464}

TBR=dalecurtis@chromium.org,caseq@chromium.org,tmathmeyer@chromium.org

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

Bug: 1148757
Change-Id: I61920a94635369846e0781ac22b072f0cd7ee4c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547423Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828774}

third_party/blink/renderer/core/inspector/inspector_media_context_impl.cc

@@ -88,13 +88,11 @@ WebString MediaInspectorContextImpl::CreatePlayer() {
 }
 
 void MediaInspectorContextImpl::RemovePlayer(WebString playerId) {
-  const auto& player_iter = players_.find(playerId);
-  DCHECK(player_iter != players_.end());
-  const Member<MediaPlayer>& player = player_iter->value;
-  DCHECK(player);
-
+  const auto& player = players_.find(playerId);
+  DCHECK(player != players_.end());
   total_event_count_ -=
-      player->errors.size() + player->events.size() + player->messages.size();
+      (player->value->errors.size() + player->value->events.size() +
+       player->value->messages.size());
   players_.erase(playerId);
 }
 
@@ -136,6 +134,7 @@ void MediaInspectorContextImpl::DestroyPlayer(const WebString& playerId) {
     // unsent players become dead when destroyed.
     unsent_players_.EraseAt(unsent_players_.Find(String(playerId)));
     dead_players_.push_back(playerId);
+    players_.erase(playerId);
   } else {
     expendable_players_.push_back(playerId);
   }