Revert "WebCrypto: Add the Key parameter to a number of operations." (r155013).

normalize-algorithm.html started timing out on Win Debug: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29%281%29/builds/6092.

TBR=eroman
BUG=

Review URL: https://codereview.chromium.org/20914002

git-svn-id: svn://svn.chromium.org/blink/trunk@155056 bbb929c8-8fbe-4397-9dbb-9b2b20218538