Add nverne to controller/OWNERS

I will be on-hook for populating this directory in the short term.

Bug: 738768
Change-Id: I01a1ef5456f3dacb4eec645df8d12cf762d7fc52
Reviewed-on: https://chromium-review.googlesource.com/580013Reviewed-by: Stuart Langley <slangley@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488595}

third_party/WebKit/Source/controller/OWNERS

 dcheng@chromium.org
 haraken@chromium.org
+nverne@chromium.org
 slangley@chromium.org
 tkent@chromium.org