Make the fuchsia mojo/public repo the source of truth.

mojo/public/platform/native/gles2_impl_ext_discard_framebuffer_thunks.c

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file is auto-generated from
-// gpu/command_buffer/build_gles2_cmd_buffer.py
-// It's formatted by clang-format using chromium coding style:
-//    clang-format -i -style=chromium filename
-// DO NOT EDIT!
-
-#include "mojo/public/platform/native/gles2_impl_ext_discard_framebuffer_thunks.h"
-
-#include <assert.h>
-
-#include "mojo/public/platform/native/thunk_export.h"
-
-static struct MojoGLES2ImplEXTDiscardFramebufferThunks
-    g_impl_ext_discard_framebuffer_thunks = {0};
-
-#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS)   \
-  ReturnType GL_APIENTRY gl##Function PARAMETERS {                   \
-    assert(g_impl_ext_discard_framebuffer_thunks.Function);          \
-    return g_impl_ext_discard_framebuffer_thunks.Function ARGUMENTS; \
-  }
-#include "mojo/public/platform/native/gles2/call_visitor_ext_discard_framebuffer_autogen.h"
-#undef VISIT_GL_CALL
-
-THUNK_EXPORT size_t MojoSetGLES2ImplEXTDiscardFramebufferThunks(
-    const struct MojoGLES2ImplEXTDiscardFramebufferThunks*
-        gles2_impl_ext_discard_framebuffer_thunks) {
-  if (gles2_impl_ext_discard_framebuffer_thunks->size >=
-      sizeof(g_impl_ext_discard_framebuffer_thunks))
-    g_impl_ext_discard_framebuffer_thunks =
-        *gles2_impl_ext_discard_framebuffer_thunks;
-  return sizeof(g_impl_ext_discard_framebuffer_thunks);
-}