Remove brettw from some owners files.

TBR=cpu

Review URL: https://codereview.chromium.org/626643002

Cr-Commit-Position: refs/heads/master@{#297923}

OWNERS

 darin@chromium.org
 ben@chromium.org
 per-file .gitignore=*
-per-file .gn=brettw@chromium.org
-per-file BUILD.gn=brettw@chromium.org
 per-file DEPS=*
 per-file AUTHORS=*
 per-file WATCHLISTS=*

build/util/OWNERS

-per-file BUILD.gn=set noparent
-per-file BUILD.gn=brettw@chromium.org

chrome/browser/history/OWNERS

-brettw@chromium.org
 sky@chromium.org
 
 per-file download_database.*=benjhayden@chromium.org

chrome/browser/search/OWNERS

 kmadhusu@chromium.org
-brettw@chromium.org
 jered@chromium.org
 samarth@chromium.org
 

chrome/browser/ui/OWNERS

@@ -11,6 +11,5 @@ per-file tab_helpers.*=avi@chromium.org
 
 # Instant/Search files.
 per-file browser_instant_controller*=kmadhusu@chromium.org
-per-file browser_instant_controller*=brettw@chromium.org
 per-file browser_instant_controller*=jered@chromium.org
 per-file browser_instant_controller*=samarth@chromium.org

chrome/browser/ui/search/OWNERS

 kmadhusu@chromium.org
-brettw@chromium.org
 jered@chromium.org
 samarth@chromium.org

components/bookmarks/OWNERS

-brettw@chromium.org
 sky@chromium.org

components/history/OWNERS

-brettw@chromium.org
 sky@chromium.org
 
 per-file download_database.*=benjhayden@chromium.org

components/search/OWNERS

 kmadhusu@chromium.org
-brettw@chromium.org
 jered@chromium.org
 samarth@chromium.org

components/url_fixer/OWNERS

-brettw@chromium.org
 pkasting@chromium.org

components/visitedlink/OWNERS

-brettw@chromium.org
 sky@chromium.org