[Android] Temporarily disable CSP support and related test.

A known issue was found in the common code of csp implementation
both for Android and Tizen, so disable the bridge code in android
until the issue was fixed.

bug=https://crosswalk-project.org/jira/browse/XWALK-1022
Merge pull request #1619 from gaochun/csp2

[Android] Temporarily disable CSP support and related test.