If this behavior is expected then it should be a Warning and not an Error.
If this behavior is not expected then it should be fixed.

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13.6
BuildVersion:	17G65

$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
Google Chrome 70.0.3538.77 

## ERROR
$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --disable-gpu
[24634:775:1104/113525.925535:ERROR:gpu_process_transport_factory.cc(980)] Lost UI shared context.
Created new window in existing browser session.

## ERROR
$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --headless --disable-gpu
[1104/113509.924676:ERROR:xattr.cc(64)] setxattr org.chromium.crashpad.database.initialized on file /var/folders/zx/q1l2wwys69n60p5jdnlr6rp800jnp0/T/: Operation not permitted (1)
[1104/113509.928254:ERROR:file_io.cc(89)] ReadExactly: expected 8, observed 0
[1104/113509.930358:ERROR:xattr.cc(64)] setxattr org.chromium.crashpad.database.initialized on file /var/folders/zx/q1l2wwys69n60p5jdnlr6rp800jnp0/T/: Operation not permitted (1)
[1104/113509.990547:ERROR:gpu_process_transport_factory.cc(980)] Lost UI shared context.
[1104/113510.123636:ERROR:gl_implementation.cc(281)] Failed to load /Applications/Google Chrome.app/Contents/Versions/70.0.3538.77/Google Chrome Framework.framework/Versions/Current/Libraries/libswiftshader_libGLESv2.dylib: dlopen(/Applications/Google Chrome.app/Contents/Versions/70.0.3538.77/Google Chrome Framework.framework/Versions/Current/Libraries/libswiftshader_libGLESv2.dylib, 1): image not found


## NO ERROR
$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --disable-gpu-vsync --blacklist-accelerated-compositing --blacklist-webgl --disable-accelerated-2d-canvas --disable-accelerated-compositing --disable-accelerated-layers --disable-gpu-sandbox --disable-accelerated-video
Created new window in existing browser session.