Add dtapuska@chromium.org to blink/common/OWNERS (and sort it.)

dtapuska already owns and reviews blink/public/common/.

(Sorted because these lists get harder to read the longer they get.)

Change-Id: I3fb849854948bcaf01847b93add9f133ad7b5026
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442632Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813037}

third_party/blink/common/OWNERS

-jam@chromium.org
+dcheng@chromium.org
+dgozman@chromium.org
+dtapuska@chromium.org
+falken@chromium.org
 haraken@chromium.org
-kinuko@chromium.org
-tkent@chromium.org
+jam@chromium.org
 jbroman@chromium.org
+kinuko@chromium.org
 pfeldman@chromium.org
-dgozman@chromium.org
-dcheng@chromium.org
-falken@chromium.org
+tkent@chromium.org
 
 # COMPONENT: Blink