Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging (https://codereview.chromium.org/338193003/)

Reason for revert:
Suspect it is causing a failure of webgl_conformance_tests for this bot:

http://build.chromium.org/p/chromium.gpu/builders/Win7%20Release%20(Intel)/builds/15425

Original issue's description:
> ozone: gpu: Add plumbing for platform-specific gpu messaging
> 
> ChromeOS without X11 will do display configuration and cursor
> movement from the GPU process. This is the conduit for the messages
> needed to make this work.
> 
> This plumbing also supports other platforms with similar requirements
> (e.g. wayland's port). X11 does not need any specific messaging here,
> since we just call the X server from the browser.
> 
> BUG=377497
> TEST=content_shell --ozone-platform=egltest
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278465

TBR=piman@chromium.org,rjkroege@chromium.org,alexst@chromium.org,spang@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=377497
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278492

[chrishtr, 2014-06-19 21:32:09]

Created Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

[commit-bot: I haz the power, 2014-06-19 21:33:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/chrishtr@chromium.org/339793007/1

[commit-bot: I haz the power, 2014-06-19 21:36:55]

Change committed as 278492

[spang, 2014-06-20 14:51:16]

A revert of this CL has been created in
https://codereview.chromium.org/341253002/ by spang@chromium.org.

The reason for reverting is: This cannot have broken the !ozone build..