Revert 223506 "WebCrypto: Implement importKey() and sign() for H..."

Believe it caused a compile failure on Linux. See:
http://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Linux%20x64

> WebCrypto: Implement importKey() and sign() for HMAC in NSS
> 
> BUG=245025
> R=eroman@chromium.org,ellyjones@chromium.org
> 
> Review URL: https://chromiumcodereview.appspot.com/23569007

TBR=bryaneyler@google.com

Review URL: https://codereview.chromium.org/24205003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223612 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed