Revert of Enable GN check for webrtc/base (patchset #13 id:240001 of https://codereview.webrtc.org/2717083002/ )

Reason for revert:
Breaks Chromium because in Chromium we import WebRTC with rtc_include_tests=false (https://bugs.chromium.org/p/chromium/issues/detail?id=713179#c6).

Chromium uses webrtc/test/fuzzers and this CL adds test dependencies to neteq_rtc_fuzzer.

Original issue's description:
> Enable GN check for webrtc/base
>
> It's not possible to enable it for the rtc_base_approved
> target but since a larger refactoring is ongoing for webrtc/base
> this CL doesn't attempt to fix that.
>
> Changes made:
> * Move webrtc/system_wrappers/include/stringize_macros.h into
>   webrtc/base:rtc_base_approved_unittests (and corresponding
>   unit test to rtc_base_approved_unittests).
> * Move md5digest.* from rtc_base_approved to rtc_base_test_utils target.
> * Move webrtc/system_wrappers/include/stringize_macros.h (+test) into
>   webrtc/base.
> * Remove unused use include of webrtc/base/fileutils.h in
>   webrtc/base/pathutils.cc
>
> BUG=webrtc:6828, webrtc:3806, webrtc:7480
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2717083002
> Cr-Commit-Position: refs/heads/master@{#17766}
> Committed: https://chromium.googlesource.com/external/webrtc/+/ed754e71ae8866db641677073274e86fe704eeac

TBR=perkj@webrtc.org,tommi@webrtc.org,nisse@webrtc.org,kjellander@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:6828, webrtc:3806, webrtc:7480
NOTRY=True

Review-Url: https://codereview.webrtc.org/2838683002
Cr-Commit-Position: refs/heads/master@{#17849}

1 files changed, 0 insertions, 1 deletions

diff --git a/.gn b/.gn
index 585ff30842..f8a113af18 100644
--- a/.gn
+++ b/.gn
@@ -24,7 +24,6 @@ secondary_source = "//build/secondary/"
 check_targets = [
   "//webrtc/api/*",
   "//webrtc/audio/*",
-  "//webrtc/base/*",
   "//webrtc/call/*",
   "//webrtc/common_video/*",
   "//webrtc/common_audio/*",