Remove Mojo bindings environment.

mojo/public/c/gles2/BUILD.gn

 # 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.
 
 config("gles2_config") {
   defines = [ "GLES2_USE_MOJO" ]
 }
 
 source_set("gles2") {
   sources = [
     "chromium_extension.h",
     "gles2.h",
     "gles2_call_visitor_autogen.h",
     "gles2_call_visitor_chromium_extension_autogen.h",
     "gles2_export.h",
     "gles2_types.h",
   ]
 
   public_configs = [ ":gles2_config" ]
 
   public_deps = [
-    "//mojo/public/c/environment",
     "//mojo/public/c/system",
   ]
 }