Sorry but that's not how it goes, Google can exert control on forks by increasing the difficulty of maintaining changes. The forks have a vested interest in staying compatible with upstream to benefit from Chromium changes over time, which unfortunately means they avoid making any deep changes to the code. None of the Chromium forks are hard ones, unlike Chromium itself which was a hardfork of Apple's webkit, which in turn was a hard fork off KDE's KHTML.

Also, Mozilla should DEFINITELY NOT adopt Chromium. We need diversity in web browsers, the idea is that by having different user agents we give the user more bargain power over how they want to browse the web. Remember, Google, Microsoft and Apple are NOT your friends, all they want is to ransack everything and increase their shareholder values. If they can turn the web proprietary and fully locked down, they will.