Move ChromeClientImplTest to web/tests/

This is part of a work of moving unit tests files out of WebKit/chromium/tests/
into web/tests/ directory.

BUG=None
TEST=webkit_unit_tests
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/19267015

git-svn-id: svn://svn.chromium.org/blink/trunk@154329 bbb929c8-8fbe-4397-9dbb-9b2b20218538