flags: fix two errant owners

These both have unqualified usernames but the actual correct email
addresses are at domains other than chromium.org.

Bug: None
Change-Id: If1e1153fa53cd43b24008c43b2892025a74bc554
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014103Reviewed-by: Cliff Smolinsky <cliffsmo@microsoft.com>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734056}

chrome/browser/flag-metadata.json

@@ -1019,7 +1019,7 @@
   },
   {
     "name": "enable-aura-tooltips-on-windows",
-    "owners": [ "cliffsmo" ],
+    "owners": [ "cliffsmo@microsoft.com" ],
     "expiry_milestone": 78
   },
   {
@@ -1127,7 +1127,7 @@
   },
   {
     "name": "enable-caption-settings",
-    "owners": [ "evliu" ],
+    "owners": [ "evliu@google.com" ],
     "expiry_milestone": 80
   },
   {