Add Mathieu as an autofill OWNER

BUG=None
R=mathp@chromium.org

Review URL: https://codereview.chromium.org/1612983004

Cr-Commit-Position: refs/heads/master@{#370764}

chrome/browser/autofill/OWNERS

 estade@chromium.org
 isherman@chromium.org
+mathp@chromium.org
 vabr@chromium.org

chrome/renderer/autofill/OWNERS

 estade@chromium.org
 isherman@chromium.org
+mathp@chromium.org
 vabr@chromium.org
 
 per-file password*=gcasto@chromium.org

components/OWNERS

@@ -16,9 +16,11 @@ per-file audio_modem.gypi=xiyuan@chromium.org
 # Can not match autofill* due to crbug.com/397984
 per-file autofill.gypi=estade@chromium.org
 per-file autofill.gypi=isherman@chromium.org
+per-file autofill.gypi=mathp@chromium.org
 per-file autofill.gypi=vabr@chromium.org
 per-file autofill_strings.grdp=estade@chromium.org
 per-file autofill_strings.grdp=isherman@chromium.org
+per-file autofill_strings.gypi=mathp@chromium.org
 per-file autofill_strings.gypi=vabr@chromium.org
 
 per-file bookmark_bar_strings.grdp=sky@chromium.org

components/autofill/OWNERS

 estade@chromium.org
 isherman@chromium.org
+mathp@chromium.org
 vabr@chromium.org
 
 # Owners for password autofill/generation only.