Add two new autofill browser tests.
Add two new autofill browser tests.

* Test that autofill can be initiated by pressing the down arrow in a fillable field.
* Test that autofill works after reloading the page.

BUG=69219
TEST=interactive_ui_test --gtest_filter=AutoFillTest.*

Review URL: http://codereview.chromium.org/6316001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71406 0039d316-1c4b-4281-b951-d872f2087c98

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