When we are running chrome_public_test_vr_apk__apk__final_dex__proguard, accessibility_test_framework_java gives us 100s of errors, all referencing com.google.protobuf.* - a sample from this looks like: 

Warning: com.google.android.apps.common.testing.accessibility.framework.proto.FrameworkProtos$AccessibilityCheckResultProto: can't find referenced class com.google.protobuf.Message$Builder
Warning: com.google.android.apps.common.testing.accessibility.framework.proto.FrameworkProtos$AccessibilityCheckResultProto: can't find referenced class com.google.protobuf.Message
Warning: com.google.android.apps.common.testing.accessibility.framework.proto.FrameworkProtos$AccessibilityCheckResultProto$Builder: can't find referenced class com.google.protobuf.GeneratedMessage$Builder
Warning: com.google.android.apps.common.testing.accessibility.framework.proto.FrameworkProtos$AccessibilityCheckResultProto$Builder: can't find referenced class com.google.protobuf.Descriptors$Descriptor

Ideally, we either don't use accessibility_test_framework_java any more, or we fix it so that it uses protolite instead of the "normal" version.