Fixes hover over keys changing cursor icon.

BUG=344943

Review URL: https://codereview.chromium.org/172263003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252157 0039d316-1c4b-4281-b951-d872f2087c98

ui/keyboard/resources/main.css

@@ -13,6 +13,7 @@ body {
   -webkit-user-select: none;
   background-image: -webkit-linear-gradient(#282828, #000000);
   background-size: cover;
+  cursor: default;
   margin: 0;
   overflow: hidden;
   padding: 0;