remove ETC2/EAC texture support in core WebGL 2

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 5c070f1f2252fc1f344cd021d4572991fa1356cc..21f8b65626abc6141764d6c69f4d06f4ba7dae56 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -10948,7 +10948,6 @@ extern const NameToFunc g_gles2_function_table[] = {
           f.write(code % {
             'name': ToUnderscore(name),
           })
-      f.write("UpdateETCCompressedTextureFormats();");
       f.write("}\n\n");
 
       f.write("void Validators::UpdateETCCompressedTextureFormats() {\n")
@@ -11022,12 +11021,6 @@ const size_t GLES2Util::enum_to_string_table_len_ =
             for es3_enum in _NAMED_TYPE_INFO[enum]['valid_es3']:
               if not es3_enum in valid_list:
                 valid_list.append(es3_enum)
-          if enum in [
-              'CompressedTextureFormat',
-              'TextureInternalFormatStorage',
-            ]:
-            for es3_enum in _ETC_COMPRESSED_TEXTURE_FORMATS:
-              valid_list.append(es3_enum)
           assert len(valid_list) == len(set(valid_list))
           if len(valid_list) > 0:
             f.write("  static const EnumToString string_table[] = {\n")