Uses string16 for ActivityViewModel::GetTitle()

Uses string16 for ActivityViewModel::GetTitle()

BUG=381858
R=oshima@chromium.org
TEST=compile succeeds

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275708

[oshima, 2014-06-06 21:11:32]

lgtm

[Jun Mukai, 2014-06-07 00:13:20]

The CQ bit was checked by mukai@chromium.org

[commit-bot: I haz the power, 2014-06-07 00:16:36]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mukai@chromium.org/322553004/20001

[commit-bot: I haz the power, 2014-06-07 05:43:40]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-06-07 06:13:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-07 06:13:59]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[Jun Mukai, 2014-06-07 18:47:16]

The CQ bit was checked by mukai@chromium.org

[commit-bot: I haz the power, 2014-06-07 18:48:07]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mukai@chromium.org/322553004/40001

[commit-bot: I haz the power, 2014-06-07 23:33:54]

Change committed as 275708