When searching using the omnibox, the search icon and text should be aligned with the icons and text in the omnibox dropdown. Because the omnibox and its dropdown are implemented in two separate classes, it's easy for these items to become misaligned after a change. We need the following tests (probably added to the omnibox dropdown tests):

1. Confirm that the omnibox search icon is aligned with the dropdown's column of icons
2. Confirm that the left edge of the omnibox's text is aligned with the left edge of the text in the omnibox dropdown's items