Simplify mojo/application/public/cpp/BUILD.gn to call the target cpp instead of application.

Simplify mojo/application/public/cpp/BUILD.gn to call the target cpp instead of application.

That way other targets that depend on it don't have to specify ":application".

Committed: https://crrev.com/a20d1d5f8a763eed8adbe080811e7b4777578f9d
Cr-Commit-Position: refs/heads/master@{#330020}

[jam, 2015-05-15 00:30:48]

jam@chromium.org changed reviewers:
+ msw@chromium.org

[msw, 2015-05-15 00:54:18]

lgtm

[jam, 2015-05-15 01:02:08]

The CQ bit was checked by jam@chromium.org

[jam, 2015-05-15 01:02:08]

The patchset sent to the CQ was uploaded after l-g-t-m from msw@chromium.org
Link to the patchset: https://codereview.chromium.org/1136763003/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-05-15 01:03:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136763003/20001

[commit-bot: I haz the power, 2015-05-15 02:00:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-15 02:01:11]

Patchset 2 (id:??) landed as
https://crrev.com/a20d1d5f8a763eed8adbe080811e7b4777578f9d
Cr-Commit-Position: refs/heads/master@{#330020}