If you are not an open-sourcer, you are unlikely to know about Chromium. Chromium is Google's open-source basis for their Chrome browser. The parts of the browser that Google does not necessarily care about get included into the base, and that code is released to the world for whatever purposes. I'm not sure why anyone would want it, but there it is in case you do.
Recently, Google began post-loading an extension into the browser: its OK, Google voice prompt feature. This extension was not directly included into the open-source release, but the call to install it was. Therefore, this does not EXACTLY violate general open-source policy, but it certainly rubbed the open-source community the wrong way. Mostly for two reasons: the code for the extension is not open-source, and the extension was always listening to you waiting for "OK, Google" to be spoken.
Now, it is important to mention that this community is interesting. They believe that data should be open, but are afraid of their privacy. So, information that is collected about you online should be shared with everyone, but not about them, I suppose. Because of this, and the lack of code for the extension, the community panicked about what Google might be storing and how it might be used. This is a good fear, as Google has never proven itself to be particularly trustworthy or ethical about its intentions.
In this particular case, however, it is easy to see in the task manager that the feature is disabled and that the microphone is not engaged, nor is any data being transferred, but that was not enough to satisfy them. Google has since decided to stop including the feature as part of the standard install, hoping to pacify the loudest of the loud, and possibly to try and do a little damage control.