Revert "enable color4f doc examples"

This reverts commit b84576af0a4386a88bf5f8453b8ff7bc0db3adcc.

Reason for revert: Need to revert original CL.

Original change's description:
> enable color4f doc examples
> 
> fiddle has picked up the SkPaint::(get)(set)Color4f
> include change, so the doc examples are ready to
> check in.
> 
> NOTRY=true
> R=​brianosman@google.com
> 
> Docs-Preview: https://skia.org/?cl=151370
> Bug: skia:6898
> Change-Id: I2c7ad3ce892ea6c8fde524df8e48a3c5713e2ba9
> Reviewed-on: https://skia-review.googlesource.com/151370
> Reviewed-by: Cary Clark <caryclark@skia.org>
> Commit-Queue: Cary Clark <caryclark@skia.org>
> Auto-Submit: Cary Clark <caryclark@skia.org>

TBR=brianosman@google.com,caryclark@skia.org

Change-Id: Iec47490505b532eb496f0eab8de9678fb5b7dcbf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:6898
Reviewed-on: https://skia-review.googlesource.com/151542
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed