Enable proguarding the WebView APK.

Enable proguarding the WebView APK.

Proguard was disabled for WebView as the configuration was out of date.
Re-enable it now the configuration has been updated.

BUG=442348
Committed: https://crrev.com/edefec8e457e96dcfa7251f7fadfa24605f8a9fb
Cr-Commit-Position: refs/heads/master@{#338856}

[Torne, 2015-07-06 13:11:34]

torne@chromium.org changed reviewers:
+ sgurun@chromium.org

[Torne, 2015-07-06 13:11:35]

Depends on https://codereview.chromium.org/1218303002/ to update the
configuration; keeping it separate so it can be reverted easily if we hit a
problem.

[sgurun-gerrit only, 2015-07-06 17:37:59]

On 2015/07/06 13:11:35, Torne wrote:
> Depends on https://codereview.chromium.org/1218303002/ to update the
> configuration; keeping it separate so it can be reverted easily if we hit a
> problem.

lgtm

[Torne, 2015-07-07 14:04:31]

Holding off landing this until after M45 branch point after discussing with
amineer@. We'll have more time to soak and verify this doesn't break anything
that way.

[Torne, 2015-07-15 14:10:35]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2015-07-15 14:10:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1226813002/1

[commit-bot: I haz the power, 2015-07-15 14:34:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-15 14:35:54]

Patchset 1 (id:??) landed as
https://crrev.com/edefec8e457e96dcfa7251f7fadfa24605f8a9fb
Cr-Commit-Position: refs/heads/master@{#338856}

[Yusuf, 2015-07-15 22:41:14]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1239703003/ by yusufo@chromium.org.

The reason for reverting is: Broke release builds downstream.

crbug.com/510625.