Add inherited libs and lib_dirs to GN.

The libs and lib_dirs are pushed up the tree until they reach a shared library or executable. Additionally, I added prefixes in the toolchain to specify these.

This converts ldflags to be per-target rather than inherited which was previously used to implement this feature.

Rename includes to include_dirs for consistency with lib_dirs.

Remove the sill swap_in_* inline functions and just do foo().swap().

BUG=
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Review URL: https://codereview.chromium.org/26074002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227328 0039d316-1c4b-4281-b951-d872f2087c98
46 files changed