Use std::tie() for operator< in ui/

Use std::tie() for operator< in ui/

Simplify the code for operator< when comparing multiple members using
a common std::tie idiom.

BUG=555171
R=danakj@chromium.org,benwells@chromium.org

Committed: https://crrev.com/7faa086b0179eea33c7cb9ded9964dc560ca42bd
Cr-Commit-Position: refs/heads/master@{#360706}

[jsbell, 2015-11-19 22:33:21]

danakj@ - can you review ui/gfx?
benwells@ - can you review ui/app_list ?

[danakj, 2015-11-19 23:08:00]

LGTM thanks

[Matt Giuca, 2015-11-19 23:45:28]

mgiuca@chromium.org changed reviewers:
+ mgiuca@chromium.org

[Matt Giuca, 2015-11-19 23:45:28]

app_list lgtm (on behalf of benwells).

[jsbell, 2015-11-20 01:17:21]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2015-11-20 01:19:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1464603003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1464603003/1

[commit-bot: I haz the power, 2015-11-20 01:27:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-20 01:27:59]

Patchset 1 (id:??) landed as
https://crrev.com/7faa086b0179eea33c7cb9ded9964dc560ca42bd
Cr-Commit-Position: refs/heads/master@{#360706}