Remove use of random_shuffle() in PermutedEntropyProvider.

Remove use of random_shuffle() in PermutedEntropyProvider.

Although all current toolchains that we use have the
same algorithm backing that function, it is apparently
not guaranteed by the spec and the libc++ implementation
differs.

Since we rely on consistent results here, change the code
to do its own shuffle using the same algorithm.

Correctness is already covered by existing tests.

BUG=358564
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261381

[jwd, 2014-04-02 17:21:03]

lgtm

[Alexei Svitkine (slow), 2014-04-02 17:25:24]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2014-04-02 17:26:15]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asvitkine@chromium.org/222373002/1

[commit-bot: I haz the power, 2014-04-02 17:34:19]

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

[commit-bot: I haz the power, 2014-04-02 17:34:19]

Try jobs failed on following builders:
  tryserver.chromium on win_chromium_compile_dbg

[Alexei Svitkine (slow), 2014-04-02 17:35:31]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2014-04-02 17:36:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asvitkine@chromium.org/222373002/1

[commit-bot: I haz the power, 2014-04-03 00:31:59]

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

[commit-bot: I haz the power, 2014-04-03 00:31:59]

Retried try job too often on android_aosp for step(s) compile
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_ao...

[Alexei Svitkine (slow), 2014-04-03 00:37:14]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2014-04-03 00:38:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asvitkine@chromium.org/222373002/1

[commit-bot: I haz the power, 2014-04-03 10:12:23]

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

[commit-bot: I haz the power, 2014-04-03 10:12:24]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[Alexei Svitkine (slow), 2014-04-03 13:51:15]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2014-04-03 13:51:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/asvitkine@chromium.org/222373002/1

[commit-bot: I haz the power, 2014-04-03 14:41:44]

Change committed as 261381