Correct keithlee@chrome => keithlee@chromium

Change-Id: Ib13671f7f5c6e122eae979b97bd8f3d109d1eb42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586284
Auto-Submit: Keith Lee <keithlee@chromium.org>
Reviewed-by: John Palmer <jopalmer@chromium.org>
Commit-Queue: John Palmer <jopalmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835901}

chrome/browser/resources/chromeos/emoji_picker/OWNERS

 jopalmer@chromium.org
-keithlee@chrome.org
+keithlee@chromium.org
 
 # COMPONENT: OS>Inputs

chrome/browser/ui/webui/chromeos/emoji/OWNERS

 jopalmer@chromium.org
-keithlee@chrome.org
+keithlee@chromium.org