remove ETC2/EAC texture support in core WebGL 2

gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h

 // 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!
 
@@ skipping 1484 matching lines @@
       arraysize(valid_texture_internal_format_storage_table_es3));
   texture_parameter.AddValues(valid_texture_parameter_table_es3,
                               arraysize(valid_texture_parameter_table_es3));
   texture_stencil_renderable_internal_format.AddValues(
       valid_texture_stencil_renderable_internal_format_table_es3,
       arraysize(valid_texture_stencil_renderable_internal_format_table_es3));
   vertex_attrib_type.AddValues(valid_vertex_attrib_type_table_es3,
                                arraysize(valid_vertex_attrib_type_table_es3));
   vertex_attribute.AddValues(valid_vertex_attribute_table_es3,
                              arraysize(valid_vertex_attribute_table_es3));
-  UpdateETCCompressedTextureFormats();
 }
 
 void Validators::UpdateETCCompressedTextureFormats() {
   compressed_texture_format.AddValue(GL_COMPRESSED_R11_EAC);
   compressed_texture_format.AddValue(GL_COMPRESSED_SIGNED_R11_EAC);
   compressed_texture_format.AddValue(GL_COMPRESSED_RG11_EAC);
   compressed_texture_format.AddValue(GL_COMPRESSED_SIGNED_RG11_EAC);
   compressed_texture_format.AddValue(GL_COMPRESSED_RGB8_ETC2);
   compressed_texture_format.AddValue(GL_COMPRESSED_SRGB8_ETC2);
   compressed_texture_format.AddValue(
@@ skipping 10 matching lines @@
   texture_internal_format_storage.AddValue(GL_COMPRESSED_SRGB8_ETC2);
   texture_internal_format_storage.AddValue(
       GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   texture_internal_format_storage.AddValue(
       GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   texture_internal_format_storage.AddValue(GL_COMPRESSED_RGBA8_ETC2_EAC);
   texture_internal_format_storage.AddValue(GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC);
 }
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_