[monet] Remove //gpu and //third_party/khronos.

third_party/khronos/README.chromium

-Name: Khronos header files
-Short Name: khronos_headers
-URL: http://www.khronos.org/registry
-Version: unknown
-Date: 2014-11-26
-License: MIT/X11, SGI Free Software License B
-Security Critical: no
-
-Description:
-This package contains header files for the EGL and OpenGL ES APIs from
-Khronos. They are used for compiling code against these APIs as well as for
-generating the GL binding initialization logic.
-
-MIT/X11 (BSD like) license is for {EGL,KHR}/*, SGI Free Software License B is
-for noninclude/GL/*, GLES2/* and GLES3/*.
-
-Local Modifications:
-
-NOTE: Please add Chromium-specific declarations to files in gpu/{GL,EGL,GLES2}
-and not here.
-
-noninclude/GL/glext.h
- - Added missing function prototypes and enums for GL_KHR_robustness
-GLES2/gl2.h
- - Added include of gl2chromium.h
-GLES2/gl2ext.h
- - Chromium-specific define to account for issues in gles2_conform_test,
-   see http://crbug.com/329708.
- - Commented out GL_SAMPLER, conflicts with third_party/gles2_conform
- - Drop const from last argument of GLDEBUGPROCKHR (win trybot fail)
- - Added ifdef around GL_LINES_ADJACENCY_EXT to fix conflict with OSX
-   OpenGL framework headers.
-EGL/eglplatform.h
- - Added EGLNative*Type for Mac.
- - Added EGLNative*Type for native linux framebuffers.
-EGL/eglext.h
- - Added EGL_ARM_implicit_external_sync extension tokens
-KHR/khrplatform.h
- - Modified KHRONOS_APICALL and KHRONOS_APIENTRY
-DEPS
- - Added DEPS file to prevent inclusion of external dependencies.