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Don't clobber existing styles when adding more in IE9

Authored by matmarex.

Description

Don't clobber existing styles when adding more in IE9

Follow-up to c2e8f505c12ace6af42161bf9930d483b1721f2e. This was really
stupid and I feel stupid.

Bug: T114323
Change-Id: I80292083d8fd50c2e2727446e4468b6a13ad40e5