Merge 221609 "Prefer to generate SHA-1 signatures for TLS 1.2 cl..."

Merge 221609 "Prefer to generate SHA-1 signatures for TLS 1.2 cl..."

> Prefer to generate SHA-1 signatures for TLS 1.2 client authentication if
> the client private key is a 1024-bit RSA or DSA key.
> 
> Older Estonian ID cards with 1024-bit RSA keys cannot sign SHA-256
> hashes.
> 
> 1024-bit DSA keys were formerly specified to be used with SHA-1 only.
> 
> R=agl@chromium.org,rsleevi@chromium.org
> BUG=278370
> TEST=manual testing by someone who has an older Estonian ID card
> 
> Review URL: https://chromiumcodereview.appspot.com/23596013

TBR=wtc@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=223079

[wtc, 2013-09-13 18:15:17]

Committed patchset #1 manually as r223079.