Make GN build work on Mac again.

Make GN build work on Mac again.

This adds extension detection for lower-case ".s" assembly files (used in NSPR) in addition to the existing handling of uppercase ".S" ones.

Minor fixes for build files for Mac for dependencies and files.

Proper handling of USE_NSS and addition of USE_OPENSSL_CERTS that match the GYP build.

R=rsleevi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=265064

[Ryan Sleevi, 2014-04-18 00:25:07]

LGTM mod comment nit

https://codereview.chromium.org/242173002/diff/20001/build/config/BUILD.gn
File build/config/BUILD.gn (right):

https://codereview.chromium.org/242173002/diff/20001/build/config/BUILD.gn#ne...
build/config/BUILD.gn:113: # USE_NSS_CERTS to match OpenSSL and our build flag
definitions.
No it should not.

OpenSSL having two flags is part of the transition away from NSS. USE_NSS is
going to go away entirely - but this flag is certainly not going to be renamed
before then. There's the distinction so that we could explicitly avoid #ifdef
churn renaming all of USE_OPENSSL / USE_NSS to something different.

https://codereview.chromium.org/242173002/diff/20001/net/BUILD.gn
File net/BUILD.gn (right):

https://codereview.chromium.org/242173002/diff/20001/net/BUILD.gn#newcode280
net/BUILD.gn:280: if (!use_nss_certs) {
FYI -
https://code.google.com/p/chromium/codesearch#chromium/src/net/net.gyp&l=449

[brettw, 2014-04-21 20:55:02]

Committed patchset #3 manually as r265064.