Disclaimer: I avoid Chrome browser exactly because I don't have enough information to know if they really "aren't evil." I don't claim there isn't such information somewhere, just that I don't know about it. My worries are exactly because their installers install more like a malware than like clean projects ("no we aren't going to let you to simply download executables, just click here, give us administrative privileges and enjoy when we download what we want and change on your machine what we like").
Anybody who knows more?
Apps without source-code cannot be trusted by default, unless you have a contract with the company providing it that stipulates a relief agreement that's reasonable for you in case anything goes wrong. And only enterprise software does that, depending on how you negotiate nonetheless, otherwise for consumers the EULAs are doing the exact opposite. And even with enterprise software guarded by good contracts, even then you need the source-code.
For more abstract take on this topic, I direct to Gödel, Escher, Bach; Hofstadter elaborates there on the fact that the distinction between what is data storage (e.g. music CD) and reading device (e.g. music player) is somewhat arbitrary, and in fact the information itself is "stored" in the combination of "data storage" and "data reader".
* - or at least most, IANAB.
https://code.google.com/p/chromium/wiki/ChromiumBrowserVsGoo...