[cleanup] Delete the *Internal wrapper functions.

These were a leftover from the shared_webcrypto refactor.

BUG=245025

Review URL: https://codereview.chromium.org/170843006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252225 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed