Mark sync_integration_tests as non-experimental on Win10 Tests x64

The reason for marking them experimental was resolved months ago.

Bug: 933356
Change-Id: Ie02ea8fb15ec4f82a234640dbcc122a58c0506b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771958Reviewed-by: smut <smut@google.com>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691149}

testing/buildbot/chromium.win.json

@@ -2680,7 +2680,6 @@
         "test": "storage_unittests"
       },
       {
-        "experiment_percentage": 100,
         "merge": {
           "args": [],
           "script": "//testing/merge_scripts/standard_gtest_merge.py"

testing/buildbot/test_suite_exceptions.pyl

@@ -1425,9 +1425,6 @@
           'shards': 2,
         },
       },
-      'Win10 Tests x64': {
-        'experiment_percentage': 100, # https://crbug.com/933356
-      },
       'Win10 Tests x64 (dbg)': {
         'experiment_percentage': 100, # https://crbug.com/840369
       },