Disable Release Notes for M82

Bug: 1047288
Change-Id: I55fec25ad936033cccdacc3880b341ac02c6374b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031868Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737071}

chromeos/constants/chromeos_features.cc

@@ -207,8 +207,8 @@ const base::Feature kReleaseNotes{"ReleaseNotes",
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables Release Notes notifications on Chrome OS.
-const base::Feature kReleaseNotesNotification{"ReleaseNotesNotification",
-                                              base::FEATURE_ENABLED_BY_DEFAULT};
+const base::Feature kReleaseNotesNotification{
+    "ReleaseNotesNotification", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables or disables long kill timeout for session manager daemon. When
 // enabled, session manager daemon waits for a longer time (e.g. 12s) for chrome