[refactor] Rename the webcrypto/openssl and webcrypto/test directories.
Since there is no longer an NSS vs OpenSSL distinction, merge these directories into a single "algorithms/" directory, and also simplify the filenames by dropping the _openssl suffix.
For example whereas before it looked like:
openssl/
rsa_oaep_openssl.cc
test/
rsa_oaep_unittest.cc
Now it looks like:
algorithms/
rsa_oaep.cc
rsa_oaep_unittest.cc
BUG=519504
Review URL: https://codereview.chromium.org/
1304063015
Cr-Commit-Position: refs/heads/master@{#349072}