These rules aren't used since commit c5c9efee1.
Note that there's still an `icon-budget` element in the
`_investment_show` partial. The rules for this icon are already defined
inside the rules for the `.budget-investment-show` selector.
The `icon-budget` and `icon-proposals` HTML classes are still used in
the "Following" tab (the code uses the `followable_icon` method), but in
this case the `.budget-investment` or `.proposal` selectors aren't
present, so the properties weren't applied here either.
Similarly, there are elements with the `icon-debates` and
`icon-proposals` HTML classes in the dashboard area, but they aren't
inside elements matching the `.debate` or `.proposal` selectors either.
And there's an element with the `icon-debate` HTML class in the
legislation area. Once again, it isn't inside an element matching the
`.debate` selector.
So can safely remove this code.
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