Disable incognito if parental controls are enabled on android.

Provides a hook to the Android application to specify whether parental
controls are enabled and incognito should be disabled.

TEST=build/android/test_runner.py gtest -s unit_tests
BUG=329276

Review URL: https://codereview.chromium.org/136693011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245390 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245390