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This is an interim solution for M10 since the final approach (drag and drop) will likely not be ready for M10. This adds inline buttons on hover/edit in the same style as the password field "Show" button, which gives a far better experience (especially when there are a lot of engines) than the old model of a single button on the side.

BUG=63825
TEST=Hovering or editing a search engine should show a "Make Default" button.

Review URL: http://codereview.chromium.org/6352004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71714 0039d316-1c4b-4281-b951-d872f2087c98