Simpler viewportAndroid.css setup for WebFrameTests.

Enable use of viewportAndroid.css by setting WebViewportStyle::Mobile
instead of explicitly parsing the sheet as part of the tests.

Also corrected some typos.

R=bokan@chromium.org

Review-Url: https://codereview.chromium.org/2423463002
Cr-Commit-Position: refs/heads/master@{#425355}
1 file changed