Add new API owners

Add Daniel, Yoav, and Ojan to the API_OWNERS file.

TBR=philipj,rbyers

Bug: 
Change-Id: Ia87e64c3c57a4c8beb7626604002b5937a6962fb
Reviewed-on: https://chromium-review.googlesource.com/747818Reviewed-by: Dimitri Glazkov <dglazkov@chromium.org>
Commit-Queue: Dimitri Glazkov <dglazkov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512990}

third_party/WebKit/API_OWNERS

@@ -2,11 +2,14 @@
 # expose to the open web.
 #
 # See https://www.chromium.org/blink#new-features for details.
+bratell@opera.com
 chrishtr@chromium.org
 darin@chromium.org
 dglazkov@chromium.org
 foolip@chromium.org
 jochen@chromium.org
 mkwst@chromium.org
+ojan@chromium.org
 rbyers@chromium.org
 tkent@chromium.org
+yoav@yoav.ws