Remove CCS matched properties entry from the testing config.

The study has ended.

Bug: 1126640, 1057072, 1166295
Change-Id: I125f5c2cd569a5c9b685636ce8d476d1871161ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625995
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843175}

testing/variations/fieldtrial_testing_config.json

@@ -1420,27 +1420,6 @@
             ]
         }
     ],
-    "CSSMatchedPropertiesCacheDependencies": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "android_webview",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "CSSMatchedPropertiesCacheDependencies"
-                    ]
-                }
-            ]
-        }
-    ],
     "CastMediaRouteProviderAndGlobalMediaControlsForCast": [
         {
             "platforms": [