[webcrypto] Use new parameter names (that end in "bits" vs "bytes").

BUG=245025

Review URL: https://codereview.chromium.org/113003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241201 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241201
Automated Commit: Committing new LKGM version 5111.0.0 for chromeos.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241202 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241202