Fixed css for selected buttons in Files.app's photo editor.

Icons were not being changed to inverted ones when pressing the buttons, as a result icons were white on almost white backgroud. This patch fixes this issue. Undo and redo buttons are not fixed yet because of missing entities.

TEST=Enter Files.app, edit a picture, click on buttons and observe if icons changes (try the rotate left button).
BUG=170288


Review URL: https://chromiumcodereview.appspot.com/11946011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177355 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed