Roll libvpx, icu, hunspell, and flac.

Roll libvpx, icu, hunspell, and flac.

This picks up the clang_warning_flags changes I landed earlier today.

For libvpx and icu, nothing else is in their rolls.

For hunspell and flac, one other change is also in the range.
hunspell: https://codereview.chromium.org/306793002/
flac: https://codereview.chromium.org/254083004/

Both look like they don't have an effect in practice, so I'm including them in
this roll. (NSS is currently preparing a real roll – crbug.com/396377 – so I'm
not rolling that at this point.)

BUG=none
TBR=hans

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287139

[Nico, 2014-08-02 00:25:30]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-08-02 00:27:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thakis@chromium.org/440513002/20001

[Nico, 2014-08-02 01:15:26]

Committed patchset #2 manually as 287139 (presubmit successful).