Update host compiler version info for android webview.

Update host compiler version info for android webview.

The android webview build now uses clang when building for host; update
the gyp variables appropriately to make sure we use reasonable compiler
flags.

BUG=377684
Committed: https://crrev.com/ed51a58fb7366557e5dc3b874aa9821d8c5d5343
Cr-Commit-Position: refs/heads/master@{#292418}

[Torne, 2014-08-28 14:18:16]

torne@chromium.org changed reviewers:
+ primiano@chromium.org, thakis@chromium.org

[Torne, 2014-08-28 14:18:16]

Hi Nico, Primiano,

This looks like the right update to the gyp file to get appropriate host clang
flags on webview now that we use clang. It works with the current flags, but
maybe in future this will be important, so it seems good to be as accurate as we
can :)

[Nico, 2014-08-28 14:24:45]

lgtm

[Torne, 2014-08-28 15:29:44]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2014-08-28 15:30:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/torne@chromium.org/516723004/1

[commit-bot: I haz the power, 2014-08-28 18:28:33]

Committed patchset #1 (id:1) as 10bc5cb4126dccb95c344d33c841d40677547dfb

[commit-bot: I haz the power, 2014-09-10 03:00:44]

Patchset 1 (id:??) landed as
https://crrev.com/ed51a58fb7366557e5dc3b874aa9821d8c5d5343
Cr-Commit-Position: refs/heads/master@{#292418}