Remove code used by --disable-delegated-renderer on Mac

Remove code used by --disable-delegated-renderer on Mac

BUG=314190
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290211

[ccameron, 2014-08-14 21:22:50]

Satisfaction writing this CL approached that of cleaning a lint trap.

There's still more stuff to do (for instance, I left the RWHVMac as a
CompositingIOSurfaceLayerClient because one of its overrided functions is called
directly, and the CompositingIOSurfaceMac can get more cleanup in future
changes), but this is about as much as could be done with only the delete key.

[jbauman, 2014-08-14 21:25:56]

lgtm

[ccameron, 2014-08-14 21:59:33]

Btw, pulled out the shaders as well.

Adding erikchen cause he noted that compiling shaders can be a source of
slowness, adding miu as FYI.

[ccameron, 2014-08-18 03:58:48]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-08-18 03:59:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/478483002/40001

[commit-bot: I haz the power, 2014-08-18 05:37:42]

Committed patchset #3 (40001) as 290211

[Mike West, 2014-08-18 06:40:13]

A revert of this CL (patchset #3) has been created in
https://codereview.chromium.org/472663004/ by mkwst@chromium.org.

The reason for reverting is: It looks like this broke layout tests on the mac
bots. See
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.9/builds/...,
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.8/builds/...,
and
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6/builds/....