Fix LabelButton preferred size calculations.

Label font/size changes in GetPreferredSize were causing infinite loops.
( the new-dialog-style edit bookmark dialog would crash on launch )
Rewrite the sizing code using a local Label object, fix for correctness too.
Remove a redundant call to SetAccessibleName.

BUG=155363
TEST=Button sizing is correct, no crashes on new-style edit bookmark dialog.
R=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15070004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199921 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed