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The previous (x) button was very tiny - 16x16 pixels, which may be too small when using a touchpad.
This patch modifies css so the x button's clickable area is extended to the surrounding paddings. As a result, it is much easier to cancel an operation.
Along the way, simplified css for actions.

TEST=Copy a large file and try to cancel. Also delete to check if Undo link is not broken.
BUG=175950

Review URL: https://codereview.chromium.org/12218135

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182373 0039d316-1c4b-4281-b951-d872f2087c98