Move android_app_version_* into an inner variables dict.

Move android_app_version_* into an inner variables dict.

This is required to allow webview to provide a separately
overrideable version code.

BUG=

Committed: https://crrev.com/81886c2785d02db150318bd7496e7493cd92db72
Cr-Commit-Position: refs/heads/master@{#323242}

[Tobias Sargeant, 2015-04-01 12:43:31]

tobiasjs@chromium.org changed reviewers:
+ jochen@chromium.org, torne@chromium.org

[Tobias Sargeant, 2015-04-01 12:48:33]

The CQ bit was checked by tobiasjs@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-04-01 12:49:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1054543002/1

[commit-bot: I haz the power, 2015-04-01 12:49:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-01 12:49:08]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Torne, 2015-04-01 13:18:06]

lgtm

[jochen (gone - plz use gerrit), 2015-04-01 14:50:37]

lgtm

[Tobias Sargeant, 2015-04-01 14:51:03]

The CQ bit was checked by tobiasjs@chromium.org

[commit-bot: I haz the power, 2015-04-01 14:51:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1054543002/1

[commit-bot: I haz the power, 2015-04-01 15:40:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-01 15:41:33]

Patchset 1 (id:??) landed as
https://crrev.com/81886c2785d02db150318bd7496e7493cd92db72
Cr-Commit-Position: refs/heads/master@{#323242}