remove the unnecessary free disk space limit

[paulsemel]

With Chromium archive sizes and extracted size being bigger, we cannot afford the 10GB surplus for the build directory.

[jonathanmetzman]

@oliverchang Do you know why we have these limits at all?

[paulsemel]

@oliverchang Do you know why we have these limits at all?

I decided to completely remove the limit. Let's wait for @oliverchang on why this was used, and I'll set this back if needed.