[Android] Fix the error when run make_apk.py with python 3.

This patch is to fix the error about missing parentheses with python 3.
In Python 3, the printed value should be surrounded with parentheses.

BUG=XWALK-3240
Merge pull request #2759 from wuhengzhi/xwalk_3240_error_on_python3

[Android] Fix the error when run make_apk.py with python 3.