Looks like while Chrome has removed the #flag, there is still a way to enable it so that Chrome can be skinned again with Windows10Blind.
Here is how you can fix the problem:
Step#1 - Create a Shortcut to Chrome.
Step#2 - Right Click the Chrome Shortcut.
Step#3 - Under the shortcut tab, where you see "Target", be sure to add this line at the end:
Because my Chrome installation is located here:
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
The "Target" section for me looks like this after the edit:
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" -disable-features=Windows10CustomTitlebar
TADA!!! I DID IT!!!
The Results of my Chrome is now skinnable again! However, it will only open up skinned if you open this shortcut only.
Feels good to finally contribute to my fellow users! 😉