Remove tests that explicitly turn on SPVC

BUG=dawn:521

Change-Id: Ic2a3b500a5c9f752a871d3f25ad4b3cc4921b0e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391609
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803977}

testing/buildbot/test_suites.pyl

@@ -2170,22 +2170,6 @@
       'dawn_end2end_tests': {
         'mixins': ['dawn_end2end_gpu_test'],
       },
-      'dawn_end2end_use_spvc_parser_tests': {
-        'mixins': ['dawn_end2end_gpu_test'],
-        'args': [
-          '--use-spvc',
-          '--use-spvc-parser',
-        ],
-        'test': 'dawn_end2end_tests',
-      },
-      'dawn_end2end_use_spvc_tests': {
-        'mixins': ['dawn_end2end_gpu_test'],
-        'args': [
-          '--use-spvc',
-          '--no-use-spvc-parser',
-        ],
-        'test': 'dawn_end2end_tests',
-      },
       'dawn_end2end_wire_tests': {
         'mixins': ['dawn_end2end_gpu_test'],
         'args': [