chromium: Clean up/remove old/unused stuff.

We no longer need to supply compiler and binutils to the build process,
se we can safely remove them. In addition, we're now passing the new
options linux_use_gold_binary and linux_use_bundled_gold to gyp, for
details, see:

https://codereview.chromium.org/239163003



Signed-off-by: aszlig <aszlig@redmoonstudios.org>