Remove incorrect log statement about showing window surface.

This log statement is purely confusing. It is logged as if it was
performing a surface operation of showing a window, but in reality
it does no such thing. Because of this the log doesn't match the
reality. Even though the window should be visible at the end of the
transaction, it isn't - the real show will be called when the
first step of the animation is performed.

Change-Id: I2b207c5df5274a67b8d650a5e84beadd7448162c