recipes: remove unused reference to swarrming_client

Python client is deprecated.

Bug: 984869
Change-Id: I288c5ed24abf0522edaa3b2fb0b236e109d51b1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3117447
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Andrii Shyshkalov <tandrii@google.com>

recipes/recipe_modules/bot_update/resources/bot_update.py

@@ -70,8 +70,6 @@ GOT_REVISION_MAPPINGS = {
     CHROMIUM_SRC_URL: {
         'got_revision': 'src/',
         'got_nacl_revision': 'src/native_client/',
-        'got_swarm_client_revision': 'src/tools/swarm_client/',
-        'got_swarming_client_revision': 'src/tools/swarming_client/',
         'got_v8_revision': 'src/v8/',
         'got_webkit_revision': 'src/third_party/WebKit/',
         'got_webrtc_revision': 'src/third_party/webrtc/',