Change product_version to user_agent_product

[deviant]

Description

Fixes compilation against CEF 91.1.0 and later. The product_version setting has been renamed to user_agent_product.

(Note: only merge this once you update the officially supported CEF to 91.1.0 (Chromium 91.0.4472.19) or later)

Motivation and Context

Fixes a compilation failure. Here's the CEF commit that caused this.

How Has This Been Tested?

Built as part of OBS 27.0 using CEF 90.6.7 on NixOS (see NixOS/nixpkgs#126505).

OBS starts up and displays the chosen web page when a Browser source is configured.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[RytoEX]

This looks like a breaking change that isn't ifdef'd, and for a version of CEF we don't officially support.

[deviant]

I'm aware of both, hence you should consider this WIP until you bump the supported version.

[deviant]

(I'm happy to stick it behind an ifdef if you can give me a pointer to the right place to define this, FWIW)

[WizardCM]

Yep, please stick this behind compile conditional as there is no guarantee on when each platform will have the relevant CEF build configured.

#if CHROME_VERSION_BUILD >= 4472
	CefString(&settings.user_agent_product) = prod_ver.str();
#else
	CefString(&settings.product_version) = prod_ver.str();
#endif