Clean up: Remove wrong or redundant CSS prefixes

* Text shadow:
  -moz-text-shadow
  > [FF22] Unknown property '-moz-text-shadow'.  Declaration dropped.
  -webkit-text-shadow
  > [Cr29] Invalid CSS property name: -webkit-text-shadow

  These never existed. If they did, they have been both unneeded
  and even removed from browsers many years ago.

  http://caniuse.com/css-textshadow

* Border radius:

  Unprefixed since
  - Firefox > 3.6
  - Chrome > 4
  - Safari > 4
  - Mobile Safari > 3

  Firefox < 4 has been blacklisted in the startup module.
  Latest Firefox dropped support for -moz-border-radius.
  > [FF12] Unknown property '-moz-border-radius'.  Declaration dropped.
  WebKit still supports both.

  Removing both -webkit and -moz.

  http://caniuse.com/border-radius

* Box shadow:
  Unprefixed since:
  - Firefox > 3.6
  - Chrome > 9
  - Safari > 5.0 (Safari 5.1 has it)
  - Mobile Safari > 4.3 (iOS 5 has it)

  Keeping -webkit for now for iOS 4.
  Removing -moz per above.

  http://caniuse.com/css-boxshadow

Change-Id: Ie5ce3202b48f42460911a7f6fa9afe4e03326c95
Merge "Clean up: Remove wrong or redundant CSS prefixes"