Revert "android_webview: go back to using system ICU."

Revert "android_webview: go back to using system ICU."

This reverts commit 96256bfea5c496aa70b1913555b1e1c7f166c426, returning
the webview build to using Chrome's copy of ICU.

BUG=409851
NOTRY=true

Committed: https://crrev.com/2f017213ed940754da2bbc24fadd5386fe82e3fc
Cr-Commit-Position: refs/heads/master@{#300092}

[Torne, 2014-10-17 12:19:36]

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

[benm (inactive), 2014-10-17 12:36:36]

lgtm

[Torne, 2014-10-17 12:41:19]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2014-10-17 12:41:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/661983002/1

[commit-bot: I haz the power, 2014-10-17 12:42:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-17 12:43:17]

Patchset 1 (id:??) landed as
https://crrev.com/2f017213ed940754da2bbc24fadd5386fe82e3fc
Cr-Commit-Position: refs/heads/master@{#300092}