am 15bb28fc: am ed7e864a: fix a few bugs in the studio download button...

am 15bb28fc: am ed7e864a: fix a few bugs in the studio download button behavior:  - make button text always white (avoid blue on blue during hover)  - revise logic to add the platform name to download button to avoid weird duplicity bug on small screens  - remove the

* commit '15bb28fc':
  fix a few bugs in the studio download button behavior:  - make button text always white (avoid blue on blue during hover)  - revise logic to add the platform name to download button to avoid weird duplicity bug on small screens  - remove the animation script when clicking download before agree because it reloaded the page (unkown cause) depends on: https://googleplex-android-review.git.corp.google.com/#/c/752757/