Normal www-client/chromium-61.0.3163.100 seems to have a missing dependency for dev-python/protobuf-python (which is currently at 3.1.0 in the funtoo tree and out of date and out sync with dev-libs/protobuf-3.4.1.
build.log snippet
FAILED: gen/third_party/dom_distiller_js/dom_distiller.pb.h gen/third_party/dom_distiller_js/dom_distiller.pb.cc pyproto/third_party/dom_distiller_js/dom_distiller_pb2.py gen/third_party/dom_distiller_js/dom_distiller_json_converter.h python ../../tools/protoc_wrapper/protoc_wrapper.py dom_distiller.proto --protoc ./protoc --proto-in-dir ../../third_party/dom_distiller_js/dist/proto --cc-out-dir gen/third_party/dom_distiller_js --py-out-dir pyproto/third_party/dom_distiller_js --plugin ../../third_party/dom_distiller_js/protoc_plugins/json_values_converter.py --plugin-out-dir gen/third_party/dom_distiller_js --plugin-options output_dir=: Traceback (most recent call last): File "../../third_party/dom_distiller_js/protoc_plugins/json_values_converter.py", line 14, in <module> from util import plugin_protos, types, writer File "/var/tmp/portage/www-client/chromium-61.0.3163.100/work/chromium-61.0.3163.100/third_party/dom_distiller_js/protoc_plugins/util/plugin_protos.py", line 22, in <module> from google.protobuf.descriptor_pb2 import FieldDescriptorProto ImportError: No module named protobuf.descriptor_pb2 --plugin_out: protoc-gen-plugin: Plugin failed with status code 1. Protoc has returned non-zero status: 1
