Don't test pipe modes nobody uses.

Don't test pipe modes nobody uses.

SkDeferredCanvas uses a simple pipe: no cross-process, no shared-address, etc.
(see src/utils/SkDeferredCanvas.cpp:306).

We could just remove these modes from the bot configs, but I'd like to take the
opportunity to simplify the DM code too.  I'll happily volunteer to put things
back should we decide we want to test these modes.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/7edca21226017e6b87a0c95fa571d34c36ceca04

[mtklein, 2015-01-21 21:11:50]

The CQ bit was checked by mtklein@google.com

[mtklein_C, 2015-01-21 21:12:21]

mtklein@chromium.org changed reviewers:
+ reed@google.com, scroggo@google.com
- mtklein@google.com

[commit-bot: I haz the power, 2015-01-21 21:12:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/861303003/1

[commit-bot: I haz the power, 2015-01-21 21:12:37]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-01-22 03:12 UTC

[scroggo, 2015-01-21 21:15:49]

On 2015/01/21 21:12:37, I haz the power (commit-bot) wrote:
> Note for Reviewers:
> The CQ is waiting for an approval.
> If you believe that the CL is not ready yet, or if you would like to L-G-T-M
> with comments then please uncheck the CQ checkbox.
> 
> Waiting for LGTM from valid reviewer(s) till 2015-01-22 03:12 UTC

lgtm

[commit-bot: I haz the power, 2015-01-21 21:18:54]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7edca21226017e6b87a0c95fa571d34c36ceca04