Web MIDI: move static helper methods to functions in anonymous namespace

Web MIDI: move static helper methods to functions in anonymous namespace

BUG=n/a
TEST=n/a

Committed: https://crrev.com/d5e96783cb8c3c6b1d77bb61d999f4323e648232
Cr-Commit-Position: refs/heads/master@{#299433}

[Takashi Toyoshima, 2014-10-10 13:03:17]

toyoshim@chromium.org changed reviewers:
+ yhirano@chromium.org

[Takashi Toyoshima, 2014-10-10 13:04:54]

PTAL.

This is just a mechanical change to prepare coming CLs to support adding
detected new devices.

[yhirano, 2014-10-10 14:45:03]

lgtm.

s/anonymous space/anonymous namespace/g

[Takashi Toyoshima, 2014-10-14 03:57:48]

thanks. updated the description.

[Takashi Toyoshima, 2014-10-14 03:57:51]

The CQ bit was checked by toyoshim@chromium.org

[commit-bot: I haz the power, 2014-10-14 03:58:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/646803005/1

[commit-bot: I haz the power, 2014-10-14 05:56:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-14 06:17:24]

Patchset 1 (id:??) landed as
https://crrev.com/d5e96783cb8c3c6b1d77bb61d999f4323e648232
Cr-Commit-Position: refs/heads/master@{#299433}