Remove rune@opera.com from core/OWNERS

Leaving Opera.

TBR=jochen@chromium.org,mstensho@opera.com
NOTRY=true

Change-Id: Ia6acfa96bc8a899b970cb4edd213cfb43a2abe2b
Reviewed-on: https://chromium-review.googlesource.com/721181Reviewed-by: Rune Lillesveen <rune@opera.com>
Commit-Queue: Rune Lillesveen <rune@opera.com>
Cr-Commit-Position: refs/heads/master@{#509353}

third_party/WebKit/Source/core/OWNERS

@@ -53,8 +53,6 @@ rego@igalia.com
 rbyers@chromium.org
 rob.buis@samsung.com
 robhogan@gmail.com
-# rune reviews core/css and parts of core/rendering
-rune@opera.com
 schenney@chromium.org
 senorblanco@chromium.org
 sashab@chromium.org