[Android] Retain the application name with space on device.

This patch is to retain the application name with space.
Get the original name, transfer it to customize.py, rewrite the
label value in AndroidManifest.xml with original name.

BUG=XWALK-1860
``VerifyResultForAppNameWithSpace`` is not a test case, it could be viewed as a public function, so I put it outside of ``TestMakeApk``. ``fun`` could be changed to ``assert_true``, what do you think? thanks.