Remove support for jarjar-ing layout.xml files.

Remove support for jarjar-ing layout.xml files.

Now that android_webview_build is being removed we no longer need
support for jarjar-ing layout.xml files. Delete the tools used to do
this, as well as the jarjar configuration for android_webview_build.

BUG=440794
Committed: https://crrev.com/15040fcb70a124db6a7886677d0c78cb7624da8a
Cr-Commit-Position: refs/heads/master@{#322860}

[Torne, 2015-03-27 12:04:16]

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

[cjhopman, 2015-03-30 18:16:36]

lgtm

[Torne, 2015-03-30 19:37:25]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2015-03-30 19:37:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1040653003/1

[commit-bot: I haz the power, 2015-03-30 20:46:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-30 20:47:47]

Patchset 1 (id:??) landed as
https://crrev.com/15040fcb70a124db6a7886677d0c78cb7624da8a
Cr-Commit-Position: refs/heads/master@{#322860}