Rationalize dependency on khronos EGL headers in place of angle.

ui/gl/gl.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 186 matching lines @@
             'gl_context_egl.cc',
             'gl_context_egl.h',
             'gl_surface_egl.cc',
             'gl_surface_egl.h',
             'gl_egl_api_implementation.cc',
             'gl_egl_api_implementation.h',
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.cc',
             '<(gl_binding_output_dir)/gl_bindings_autogen_egl.h',
           ],
           'include_dirs': [
-            '<(DEPTH)/third_party/angle/include',
-          ],
+            '<(DEPTH)/third_party/khronos',
+        ],
         }],
         ['use_x11 == 1', {
           'sources': [
             'gl_context_glx.cc',
             'gl_context_glx.h',
             'gl_glx_api_implementation.cc',
             'gl_glx_api_implementation.h',
             'gl_image_glx.cc',
             'gl_image_glx.h',
             'gl_surface_glx.cc',
@@ skipping 137 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'ui/gl',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }