Bug 1790520 - Re-adjust the tiers of wpt tests on Android fission r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D161238

taskcluster/ci/test/web-platform.yml

@@ -39,12 +39,6 @@ web-platform-tests:
     tier:
         by-test-platform:
             android-em-7.0-x86_64-qr/debug-isolated-process: 3
-            android-em-7.*:
-                by-variant:
-                    webrender-sw: 3
-                    no-fission: default
-                    webrender-sw+no-fission: default
-                    default: 3
             default: default
     chunks:
         by-test-platform:
@@ -95,9 +89,6 @@ web-platform-tests:
                     default: []
             default:
                 by-test-platform:
-                    android-em-7.0-x86_64-qr/debug-isolated-process: ['mozilla-central']
-                    android-em-7.0-x86_64-qr/debug: ['mozilla-central']
-                    android-em-7.0-x86_64-shippable-qr: ['mozilla-central']
                     android.*: []
                     .*-tsan-qr/opt: ['trunk']
                     default: built-projects