infra/config: remove omit_python2 from android builder

Bug: 1366956
Change-Id: I6acbae0e97c1b2f50fbb7cb41ea5e42311679586
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4259387
Reviewed-by: James Shen <zhiyuans@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1107291}

infra/config/generated/luci/cr-buildbucket.cfg

@@ -26261,10 +26261,6 @@ buckets {
         key: "chromium_swarming.expose_merge_script_failures"
         value: 100
       }
-      experiments {
-        key: "luci.buildbucket.omit_python2"
-        value: 0
-      }
       experiments {
         key: "luci.recipes.use_python3"
         value: 100

infra/config/subprojects/chromium/ci/chromium.android.star

@@ -857,9 +857,6 @@ ci.builder(
         short_name = "m",
     ),
     notifies = ["cronet"],
-
-    # TODO(crbug.com/1362440): remove this.
-    omit_python2 = False,
     reclient_jobs = reclient.jobs.DEFAULT,
 )