Revert "Turn on gn check for libassistant/*."

This reverts commit 23aaa1a.

Reason for revert: gn check failing since https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-google-rel/7336

Errors like

Step _generate_buildfiles failed. Error logs are shown below:
ERROR at //libassistant/shared/internal_api/c/public/logging.h:8:11: Include not allowed.
#include "base/logging.h"
          ^-------------
It is not in any dependency of
  //libassistant/shared/internal_api/c:api_wrappers
The include file is in the target(s):
  //base:base
which should somehow be reachable.
___________________
ERROR at //libassistant/shared/utils/net/http_connection_utils.h:12:11: Can't include this header from here.
#include "libassistant/shared/internal_api/http_connection.h"
          ^-------------------------------------------------
The target:
  //libassistant/shared/utils:http_connection_utils
is including a file from the target:


BUG=1010814

Original change's description:
> Turn on gn check for libassistant/*.
> 
> Merge-With: libassistant-internal/109915
> Merge-With: libassistant-internal/109885
> 
> Bug: Internal b/130382048
> Test: gn check libassistant build with two listed patches
> Change-Id: Id30a100aad39caa8b149b81bf90da81db877b104
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817418
> Auto-Submit: Simeon Anfinrud <sanfin@chromium.org>
> Reviewed-by: Luke Halliwell <halliwell@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702256}

TBR=halliwell@chromium.org,sanfin@chromium.org,jbudorick@chromium.org,danielkay@google.com

Change-Id: Ib988b21d930038b9045951628fe0ea5fff56dc2a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: Internal b/130382048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837448
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702346}

.gn

@@ -281,7 +281,7 @@ check_targets = [
 
   #"//jingle/*",
 
-  "//libassistant/*",
+  "//libassistant/communication/*",
   "//libinteraction/*",
 
   "//media/*",