GN: app_list_unittests links on Mac.

GN: app_list_unittests links on Mac.

Tested on Mac with the following command lines:
$ gn gen out-gn/Release --args='is_debug=false is_component_build=false symbol_level=1'
$ ninja -C out-gn/Release app_list_unittests

BUG=431177
TEST=see above
R=dpranke@chromium.org

CQ_EXTRA_TRYBOTS=tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

Committed: https://crrev.com/42aa017bfdf37b56605343897db81df7167f11a1
Cr-Commit-Position: refs/heads/master@{#343275}

[Dirk Pranke, 2015-08-13 20:09:27]

lgtm.

Make sure you land this -- and any mac changes -- with

CQ_EXTRA_TRYBOTS=tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

[tfarina, 2015-08-13 21:07:33]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-08-13 21:07:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1288263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1288263002/1

[commit-bot: I haz the power, 2015-08-13 21:12:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-13 21:13:50]

Patchset 1 (id:??) landed as
https://crrev.com/42aa017bfdf37b56605343897db81df7167f11a1
Cr-Commit-Position: refs/heads/master@{#343275}