Fix compile error

Change WrapRefPtr(this) to the equivalent RefPtr<T>(this).  WrapRefPtr
was added after M62 branched.

Bug: 768201, 765495
Test: 
Change-Id: I798f71cf3f36be2228eff07aecc540c05969764f
Reviewed-on: https://chromium-review.googlesource.com/682102
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/branch-heads/3202@{#430}
Cr-Branched-From: fa6a5d87adff761bc16afc5498c3f5944c1daa68-refs/heads/master@{#499098}
1 file changed