[Signin]: Kill UI to educate users in sync paused state with automatic cookie clearing setting turned on

Use the kill switch to disable
|ShowSyncPausedReasonCookiesClearedOnExit| as there is some risk
attached to it. The reason for the risk is that this could be perceived
negatively as Chrome trying to keep users from using privacy settings in
order for them to continue syncing. We have plans on how we can address
the risks and still educate users, but that will require string changes
which won't be possible for M77 anymore. Therefore, this feature will be
disabled for M77.

(cherry picked from commit 74b56bead78da4faee46e617a32bf66aa45a51de)

Bug: 992417
Change-Id: I003affdfd63963458eb84ed76b50f715aefd79b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747010
Commit-Queue: Monica Basta <[email protected]>
Commit-Queue: Thomas Tangl <[email protected]>
Reviewed-by: Thomas Tangl <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#685998}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1751734
Cr-Commit-Position: refs/branch-heads/3865@{#358}
Cr-Branched-From: 0cdcc6158160790658d1f033d3db873603250124-refs/heads/master@{#681094}
diff --git a/chrome/browser/ui/ui_features.cc b/chrome/browser/ui/ui_features.cc
index 300616a..99ecec7 100644
--- a/chrome/browser/ui/ui_features.cc
+++ b/chrome/browser/ui/ui_features.cc
@@ -32,7 +32,7 @@
 // settings set to clear cookies on exit.
 const base::Feature kShowSyncPausedReasonCookiesClearedOnExit{
     "ShowSyncPausedReasonCookiesClearedOnExit",
-    base::FEATURE_ENABLED_BY_DEFAULT};
+    base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables grouping tabs together in the tab strip. https://crbug.com/905491
 const base::Feature kTabGroups{"TabGroups", base::FEATURE_DISABLED_BY_DEFAULT};