Revert 246807 "Mojo: Move a bunch of bindings "library" stuff to..."

Causing check_licenses failure on "Android Builder (dbg)"
http://build.chromium.org/p/chromium.linux/builders/Android%20Builder%20%28dbg%29/builds/50978

> Mojo: Move a bunch of bindings "library" stuff to pylib subdirectory.
> 
> Still to do: Stuff in the generators directory, which will be split in a
> different (and more complicated) way.
> 
> R=davemoore@chromium.org
> 
> Review URL: https://codereview.chromium.org/146163002

TBR=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/146603003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246816 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246816