Temporarily remove net_unittests from chromeos-amd64-generic-rel.

To unblock LKGM rolls. Will still run on the betty bot in the meantime.

Bug: 1053547
Change-Id: Ifb2ffc7f06a6183265209d5e06c63a16215b1316
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065414Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742909}

testing/buildbot/chromium.chromiumos.json

@@ -381,35 +381,6 @@
         "test": "mojo_unittests",
         "test_target": "//mojo:mojo_unittests"
       },
-      {
-        "args": [
-          "--vpython-dir=../../vpython_dir_linux_amd64"
-        ],
-        "merge": {
-          "args": [],
-          "script": "//testing/merge_scripts/standard_gtest_merge.py"
-        },
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "cipd_packages": [
-            {
-              "cipd_package": "infra/tools/luci/vpython/linux-amd64",
-              "location": "vpython_dir_linux_amd64",
-              "revision": "git_revision:9a931a5307c46b16b1c12e01e8239d4a73830b89"
-            }
-          ],
-          "dimension_sets": [
-            {
-              "kvm": "1",
-              "os": "Ubuntu-16.04",
-              "pool": "chromium.tests.cros.vm"
-            }
-          ],
-          "shards": 3
-        },
-        "test": "net_unittests",
-        "test_target": "//net:net_unittests"
-      },
       {
         "args": [
           "--stop-ui"

testing/buildbot/test_suite_exceptions.pyl

@@ -1037,6 +1037,7 @@
   },
   'net_unittests': {
     'remove_from': [
+      'chromeos-amd64-generic-rel',  # https://crbug.com/1053547
       'fuchsia-fyi-arm64-rel',  # https://crbug.com/877248
       'fuchsia-fyi-x64-dbg',  # https://crbug.com/844416
     ],