remove swarming_client

Python client is deprecated.

This removes all the reference in this repository.
https://source.chromium.org/search?q=swarming_client&sq=&ss=chromium%2Fchromium%2Fsrc:third_party%2Fangle%2F

Bug: chromium:984869
Change-Id: Ic165f4a637208b914a057257e9e73ab251df9c53
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3114154
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

.gitignore

@@ -90,7 +90,6 @@
 /tools/protoc_wrapper
 /tools/python
 /tools/skia_goldctl
-/tools/swarming_client
 angle.iml
 angle_debug.txt
 build

DEPS

@@ -628,11 +628,6 @@ deps = {
       'condition': 'checkout_mac and not build_with_chromium',
   },
 
-  'tools/swarming_client': {
-    'url': '{chromium_git}/infra/luci/client-py.git@a32a1607f6093d338f756c7e7c7b4333b0c50c9c',
-    'condition': 'not build_with_chromium',
-  },
-
   # === ANGLE Restricted Trace Generated Code Start ===
   'src/tests/restricted_traces/aliexpress': {
       'packages': [

scripts/roll_chromium_deps.py

@@ -86,7 +86,6 @@ ANGLE_CHROMIUM_DEPS = [
     'tools/skia_goldctl/linux',
     'tools/skia_goldctl/mac',
     'tools/skia_goldctl/win',
-    'tools/swarming_client',
 ]
 
 ANGLE_URL = 'https://chromium.googlesource.com/angle/angle'