Revert "GrContext::dump that produces JSON formatted output"

This reverts commit 175af0d01177fc6e5a81e979cd2ae3009c375940.

Reason for revert: Chrome doesn't know about portable format specifiers. Sigh.

Original change's description:
> GrContext::dump that produces JSON formatted output
> 
> Includes caps, GL strings, and extensions
> 
> Bug: skia:
> Change-Id: I1e8b3dd50fb68357f9de8ca6149cf65443d027ef
> Reviewed-on: https://skia-review.googlesource.com/32340
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,brianosman@google.com

Change-Id: Ie280b25275725f0661da7541f54ed62897abb82f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/32861
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
17 files changed