android: Do not pass source_dir to package_apk.

android: Do not pass source_dir to apk-package.xml.

apkbuilder only uses sourcefolder to package non-java files (see
addSourceFolder() and checkFileForPackaging() in
https://android.googlesource.com/platform/sdk/+/e162064a7b5db1eecec34271bc7e2a4296181ea6/sdkmanager/libs/sdklib/src/com/android/sdklib/build/ApkBuilder.java ),
and our java/src folders only contain .java (and OWNERS) files.

(Determined via `find . -type f -a -path '*/src/*' -a -not -name '*.java'` and
manually ignoring everything not looking like a java folder.)

No intended behavior change; Chrome.apk looks identical with and without
this change (except for timestamps).

BUG=none
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260047

[cjhopman, 2014-03-27 20:22:17]

lgtm

[Nico, 2014-03-27 20:24:19]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-03-27 20:25:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/212173003/1

[commit-bot: I haz the power, 2014-03-28 00:12:39]

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

[commit-bot: I haz the power, 2014-03-28 00:12:40]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[Nico, 2014-03-28 00:41:53]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-03-28 00:43:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thakis@chromium.org/212173003/1

[commit-bot: I haz the power, 2014-03-28 00:51:51]

Change committed as 260047