clean up test importer to use webkit_finder and update tests

The old tests were using source_dir and repo_dir incorrectly and were
using a real filesystem. This patch fixes that and cleans up the
importer code to use webkit_finder while we're at it.

R=eseidel@chromium.org
BUG=247454

Review URL: https://codereview.chromium.org/16465007

git-svn-id: svn://svn.chromium.org/blink/trunk@152037 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed