Add owners to --enable-devtools-experiments flag

This flag is user-facing, should not have an expiration date.
See [1] for an example.

[1] https://developers.google.com/web/tools/chrome-devtools/ui#experiments

Change-Id: I287a7707d3f896515ea65481e376df5ad16251fb
Reviewed-on: https://chromium-review.googlesource.com/c/1351603Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611208}

chrome/browser/flag-metadata.json

@@ -1065,8 +1065,8 @@
   },
   {
     "name": "enable-devtools-experiments",
-    // "owners": [ "your-team" ],
-    "expiry_milestone": 76
+    "owners": [ "//third_party/blink/renderer/devtools/OWNERS" ],
+    "expiry_milestone": -1
   },
   {
     "name": "enable-display-cutout-api",