ozone: Remove experiment from content and views tests

These tests have been stable and run for quite a long time.
So, it's safe to remove the experiment now.

Bug: 700309
Change-Id: Ic9138013913dfd841cbb9ffa23fc27d3e790bf84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862462Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#706130}

testing/buildbot/chromium.linux.json

@@ -5763,7 +5763,6 @@
         "args": [
           "--ozone-platform=x11"
         ],
-        "experiment_percentage": 100,
         "merge": {
           "args": [],
           "script": "//testing/merge_scripts/standard_gtest_merge.py"
@@ -5829,7 +5828,6 @@
           "--ozone-platform=x11",
           "--test-launcher-filter-file=../../testing/buildbot/filters/ozone-linux.x11_views_unittests.filter"
         ],
-        "experiment_percentage": 100,
         "merge": {
           "args": [],
           "script": "//testing/merge_scripts/standard_gtest_merge.py"

testing/buildbot/test_suites.pyl

@@ -4586,14 +4586,12 @@
         'test': 'content_unittests',
       },
       'x11_content_unittests': {
-        'experiment_percentage': 100,
         'args': [
           '--ozone-platform=x11',
         ],
         'test': 'content_unittests',
       },
       'x11_views_unittests': {
-        'experiment_percentage': 100,
         'args': [
           '--ozone-platform=x11',
           '--test-launcher-filter-file=../../testing/buildbot/filters/ozone-linux.x11_views_unittests.filter',