You're using my PrefPane, right? These are preferences it sets by default.
Some of these are my personal preference (I made the PrefPane for myself first and foremost). For example, I dislike how by default, if you're using Chromium and you sign into e.g. your gmail account, you automatically get signed into your Google account in your browser too. You can still enable this in the UI (and need to if you want to e.g. sync bookmarks), but the PrefPane sets it off by default.
Other settings are workarounds, or partial workarounds, for Chromium Legacy limitations. For example, some UI elements in Chromium Legacy lack a drop shadow, and so can be hard to see against a white background. One of those UI elements is the print preview dialog. To have one less UI element with this problem, I switch the print preview window to the native Apple print dialog instead of the built in Chromium one.