chromium: adding updated version 24.0.1312.52

Hi,
I have updated chromium build to v24.0.1312.52.

This refactors the build a bit:
- use ninja instead of make for (just a bit) faster builds
- separate build flags into oe-defaults.gypi and include.gypi files for each arch
- add i586 arch for qemux86 (which compiles, and runs)
- clean up do_install according to https://codereview.chromium.org/11094071

Tested working with armv7a and qemux86 only, I don't have any armv6 hardware.

Thanks!

Kevin Baker <kevinb@ventureresearch.com>