[webcrypto] Remove some more instances of uint8
These crept in from a changelist written before the refactor which landed after it. BUG=394944 Review URL: https://codereview.chromium.org/400673006 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284610 0039d316-1c4b-4281-b951-d872f2087c98
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