No, Google Image Search is not CBIR. Google relies on textual metadata for its search. The "content" in CBIR is the image content - raw pixel values and all that can be learned from them (color, texture, intensity, orientation, etc.). Common CBIR queries are performed by example (providing a sample image) or by more exotic means - drawing a sketch, specifying what the color histogram might looks like, tracking eye movements, and many others.

Google Image Labeler is also not CBIR. It is an example of semantic annotation.