Files.app: Use the same file type associates as Windows on HTML files.

Files.app: Use the same file type associates as Windows on HTML files.

This CL associates .xhtm, .xhtml, and .shtml to the browser window.
The list matches what Chrome handles on Windows, enumerated at
src/chrome/installer/util/shell_util.cc#kDefaultFileAssociations.

BUG=427542
Committed: https://crrev.com/e67a5643c6656ecd0347a7cc42371e124fde323d
Cr-Commit-Position: refs/heads/master@{#302235}

[kinaba, 2014-10-31 05:59:02]

kinaba@chromium.org changed reviewers:
+ mtomasz@chromium.org

[kinaba, 2014-10-31 05:59:02]

PTAL.

The reported bug originates from ARC dogfooder group that
certain ARC apps becomes a default handler greedily, so
it will be mitigated if we implement bug 414566. However,
the suggested change (adding more file associates) also
sounds making sense to me.

[mtomasz, 2014-10-31 06:08:19]

lgtm

[kinaba, 2014-10-31 06:12:04]

The CQ bit was checked by kinaba@chromium.org

[commit-bot: I haz the power, 2014-10-31 06:12:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/693103003/1

[commit-bot: I haz the power, 2014-10-31 06:53:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-31 06:54:14]

Patchset 1 (id:??) landed as
https://crrev.com/e67a5643c6656ecd0347a7cc42371e124fde323d
Cr-Commit-Position: refs/heads/master@{#302235}