Revert 134201 - Fix framerate jank for accelerated content on windows

Revert 134201 - Fix framerate jank for accelerated content on windows

By delaying the SwapBuffersAck to after Present, we send back the Ack at the rate that D3D Presents finish, which is typically vsync or slower when GPU bound.

BUG=125232
TEST=Open WebGL Aquarium, record trace in about:tracing, verify smooth framerate.


Review URL: http://codereview.chromium.org/10222029

TBR=jbates@chromium.org


Suspected performance regression:
http://build.chromium.org/f/chromium/perf/gpu-win7-release-nvidia/gpu_frame_rate/report.html?history=150&rev=-1&graph=fireflies
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=134313