Revert "Don't delete the invalid service id."

This reverts commit d4214b50.

Reason for revert: Possibly causing WebGL failures and other assertion failures.

BUG=789621

Original change's description:
> Don't delete the invalid service id.
> 
> It was possible to put thing in a bad state by calling glBind* with an
> invalid client id (which binds the invalid service id) and then calling
> glDelete* with an invalid client id (which deletes the invald service
> id).
> 
> BUG=785753
> 
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: I4628f964e9d14a1d87bc12b1cde3f056acb8314e
> Reviewed-on: https://chromium-review.googlesource.com/791011
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Commit-Queue: Geoff Lang <geofflang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#519752}

TBR=geofflang@chromium.org,piman@chromium.org

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

Bug: 785753
Change-Id: If2343ecb8fd12c8bfc400bffa455de91f0caf8bb
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/797570Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520222}

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

@@ -65,13 +65,8 @@ error::Error DeleteHelper(GLsizei n,
     // Don't pass service IDs of objects with a client ID of 0.  They are
     // emulated and should not be deleteable
     if (client_id != 0) {
-      ServiceType service_id = id_map->GetServiceIDOrInvalid(client_id);
-      // Don't delete the invalid service ID, if bind-generates-resource is
-      // enabled then it may be currently used as a placeholder
-      if (service_id != id_map->invalid_service_id()) {
-        DCHECK(service_id != 0);
-        id_map->RemoveClientID(client_id);
-    }
+      service_ids[ii] = id_map->GetServiceIDOrInvalid(client_id);
+      id_map->RemoveClientID(client_id);
     }
   }