[webcrypto] Remove RSA-ES support (1 of 3)

Removes RSA-ES from the LayoutTests.

BUG=372920, 245025
R=adamk@chromium.org

Review URL: https://codereview.chromium.org/285823002

git-svn-id: svn://svn.chromium.org/blink/trunk@174457 bbb929c8-8fbe-4397-9dbb-9b2b20218538