Compare with: http://maps.google.com/maps?f=q&source=s_q&hl=en&...
Note that it's not just a matter of translation. First, they list Taiwan next to Hong Kong and Macau as if it's a peripheral part of China (this is surely China's wish, but the reality is that Taiwan is an independent democracy).
Then, there's a line in the water to the east of Taiwan and extending elsewhere whose sole purpose is to imply regions to be part of China's territory that are not or are controversial. This line isn't used anywhere else in the world, such as say, in the Caribbean, where the boundaries of different islands might not be clear.
I guess Google wants market share in China bad enough that they are willing to proffer multiple versions of truth.