Update Eye Dropper flag expiration to 90

This also removes all blink core owners from the email list.

Change-Id: If38edec90c3ca9214e02ef78da714545dce8ca5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595520
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837758}

chrome/browser/flag-metadata.json

@@ -560,8 +560,8 @@
   },
   {
     "name": "color-picker-eye-dropper",
-    "owners": [ "iopopesc@microsoft.com", "masonfreed", "//third_party/blink/renderer/core/OWNERS" ],
-    "expiry_milestone": 88
+    "owners": [ "iopopesc@microsoft.com", "masonfreed" ],
+    "expiry_milestone": 90
   },
   {
     "name": "color-provider-redirection",