Fix mojo build on android.

Fix mojo build on android.

Android stl library has bugs related to std::set ->
https://code.google.com/p/android/issues/detail?id=69153

This change allow this code to compile on android.

R=viettrungluu@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278657

[viettrungluu, 2014-06-19 22:10:17]

lgtm

[qsr, 2014-06-19 22:15:43]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-06-19 22:18:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/335903004/1

[commit-bot: I haz the power, 2014-06-20 03:25:30]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/8...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-06-20 03:36:42]

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

[commit-bot: I haz the power, 2014-06-20 03:36:43]

Try jobs failed on following builders:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/8...)

[qsr, 2014-06-20 05:43:54]

The CQ bit was checked by qsr@chromium.org

[commit-bot: I haz the power, 2014-06-20 05:46:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qsr@chromium.org/335903004/1

[commit-bot: I haz the power, 2014-06-20 09:48:15]

Change committed as 278657