Removed unused mojo_nacl code and GYP targets.

mojo/nacl/README.md

Index: mojo/nacl/README.md
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-About
-=====
-
-This is a prototype for plumbing Mojo into the NaCl sandbox.  It is
-currently insecure (see below), does not provide a stable ABI (IRT
-support must be added), and does not support Mojo functions that
-return pointers (for example, `MojoMapBuffer`).
-
-
-Using
-=====
-
-To use this prototype, point your `.gclient` file to `DEPS.nacl` instead
-of `DEPS` and then run `gclient sync`.
-
-When you run `mojo/tools/mojob.py gn`, add `--nacl` to the command line.
-
-Run `mojo/tools/mojob.py nacltest` for additional nacl-specific tests.
-
-
-Notes
-=====
-
-`generator/interface.py` contains a programmatic description of the
-stable Mojo interface.  This will need to be updated as the interface
-changes.  Run `generator/generate_nacl_bindings.py` to generate the
-bindings that plumb this interface into the NaCl sandbox.
-
-
-Security TODO
-=============
-
-* Separate trusted and untrusted Mojo handles.
-* Validate and copy option structures.
-* Protect untrusted buffers passed into Mojo:
-  * `NaClVmIoWillStart/HasEnded`.
-  * volatile accesses to untrusted memory (untrusted code could race).
-* Overflow checking in array bounds validation.
-