Chromium-behind-the-scene feature might break Chrome store

[gorhill]

When trying to install an extension, Chrome store sends a request looking like this when user press "install" button:

other https://lh4.googleusercontent.com/UJOWaD1RWOFPtiiCILdm1TT0qaPQc8YuVstJd9Pbkvgeaa4FIMCULDjq0Lbm6Ka_LT5cQDQqM8k=s128-h128-e365

As seen in Stats page. If this behind-the-scene request is blocked (because user chose to block googleusercontent.com hostname), Chrome store reports:

An error has occurred
There was a problem adding the item to Chrome. Please refresh the page and try again.

[gorhill]

Only solution I can think of is to allow user to disengage the behind-the-scene feature: starting to put very specific hard-coded guessed workarounds in the code is not an option.