Reland "Cut down /crypto and switch what is left of it to boringssl".

Reland "Cut down /crypto and switch what is left of it to boringssl".

This removes almost all of the /crypto code, leaving around:

 - openssl_util
 - random
 - secure_hash
 - sha2

which are used by Mojo.

This also switches the impl of secure_hash to secure_hash_openssl backed by
openssl (in third_party/boring_ssl), as the default one in secure_hash_default
is backed by NSS in /net/third_party/nss (and /net is going away).

BUG=456130
R=abarth@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/87fdb13fe8e5dcc63b803324d163ed76c746b240

[ppi, 2015-02-24 16:53:20]

ppi@chromium.org changed reviewers:
+ abarth@chromium.org, jamesr@chromium.org

[ppi, 2015-02-24 17:00:12]

Hi Adam, James,

Please refer to the email thread on mojo-dev ("Dynamic loading of the network
service and NSS (and BoringSSL)") for context on why this was reverted.

Could you review or stamp this so that it can be landed once it works (likely
after a fix on the network_service side)?

[abarth-chromium, 2015-02-24 17:10:20]

rslgtm

[abarth-chromium, 2015-02-24 17:10:26]

rs lgtm

[ppi, 2015-02-26 14:39:51]

Committed patchset #3 (id:40001) manually as
87fdb13fe8e5dcc63b803324d163ed76c746b240 (presubmit successful).