Remove unused bazel related code

They are no longer used after
https://chromium-review.googlesource.com/c/chromium/src/+/3016508 and
https://chromium-review.googlesource.com/c/chromium/src/+/3206870.

Bug: None
Change-Id: Id5d3def2d902886bc8ffd5512e2820943cac41bf
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255540
Auto-Submit: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36204}

tools_webrtc/libs/generate_licenses.py

@@ -40,7 +40,6 @@ LIB_TO_LICENSES_DICT = {
         'third_party/android_deps/libs/'
         'com_google_auto_service_auto_service/LICENSE'
     ],
-    'bazel': ['third_party/bazel/LICENSE'],
     'boringssl': ['third_party/boringssl/src/LICENSE'],
     'crc32c': ['third_party/crc32c/src/LICENSE'],
     'errorprone': [