Fix common_video_unittests in apk_tests.gyp.
Fix common_video_unittests in apk_tests.gyp.

r5265 moved common_video_unittests to its own gyp, this required an
update of apk_tests.gyp that wasn't caught by our trybots.

TBR=mflodman@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/5629004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 391b4db7debb6d4c18697141491f9ae07af5e6fc

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc