Make ui gn check pass. Misc GN build improvements.

Make ui gn check pass. Misc GN build improvements.

Content/public/app was messed up and didn't link everything properly, so this separates it out into browser and child like content/app is.

R=jamesr@chromium.org
Reland of https://codereview.chromium.org/545313002/ but with public/utility dependency added

TBR=jamesr@chromium.org

Committed: https://crrev.com/a78fdeda3324eab3427e2c8009c80fcaa906b675
Cr-Commit-Position: refs/heads/master@{#293646}

[brettw, 2014-09-06 22:36:55]

Previous patch is in patch set 1. This version adds a dependency on
//content/public/utility from //content.

[brettw, 2014-09-06 22:36:59]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2014-09-06 22:37:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/brettw@chromium.org/549863004/20001

[commit-bot: I haz the power, 2014-09-07 00:31:58]

Committed patchset #2 (id:20001) as a33cb4a847cb3d35327e9747e63cfdbd2092343c

[jamesr, 2014-09-07 04:12:44]

lgtm

[commit-bot: I haz the power, 2014-09-10 03:43:44]

Patchset 2 (id:??) landed as
https://crrev.com/a78fdeda3324eab3427e2c8009c80fcaa906b675
Cr-Commit-Position: refs/heads/master@{#293646}