Remove superfluous error messages from nanobench

Remove superfluous error messages from nanobench

When running nanobench --images, I see lots of "errors" from cases
that are simply not supported. Silence these.

BUG=skia:3418

[scroggo, 2015-10-06 17:18:10]

scroggo@google.com changed reviewers:
+ msarett@google.com

[msarett, 2015-10-06 17:31:46]

Can we change these all to SkCodecPrintf instead?  I have done that in a CL that
hasn't landed yet.

To include SkCodecPriv.h in tools, we have to go through and change all of the
functions to inline instead of static.  I have also made this change although I
don't think it has landed yet either.

[scroggo, 2015-10-06 17:42:07]

On 2015/10/06 17:31:46, msarett wrote:
> Can we change these all to SkCodecPrintf instead?  I have done that in a CL
that
> hasn't landed yet.
> 
> To include SkCodecPriv.h in tools, we have to go through and change all of the
> functions to inline instead of static.  I have also made this change although
I
> don't think it has landed yet either.

Fine with me. Can you link to the CL that makes these changes? Then I'm fine
with deleting this one, unless we decide we need this one first.

[msarett, 2015-10-06 17:45:44]

Linking the CL.
https://codereview.chromium.org/1321433002/

I wouldn't describe this as "close to landing", so if this is time-sensitive,
you or I might want to go ahead with this change.

Alternatively, since I need to break up that CL anyway, I could separate it out
when I get to that.

[msarett, 2015-10-13 20:25:07]

Can we close this now that https://codereview.chromium.org/1395383002/ has
landed?

[scroggo, 2015-10-13 20:25:42]

On 2015/10/13 20:25:07, msarett wrote:
> Can we close this now that https://codereview.chromium.org/1395383002/ has
> landed?

Yes. Closed