Revert "Add gyp build of sel_ldr and irt_core for ARM."
Revert "Add gyp build of sel_ldr and irt_core for ARM."

This reverts commit r12589 since it introduces a dependency
on the linux ARM cross compiler when to to gyp build
and this is not yet installed on the chromium trybots.
This change should be re-applied once this compiler is
installed: http://crbug.com/335303

> Add gyp build of sel_ldr and irt_core for ARM.
>
> The irt core can be built on all platforms but sel_ldr
> can only be built on linux (the only platform with an
> arm cross compiler).
>
> BUG=266959
> R=jvoung@chromium.org
>
> Review URL: https://codereview.chromium.org/93513013

BUG=266959
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/141733005

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12639 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client