Revert of Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT(). (https://coderev...

Revert of Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT(). (https://codereview.chromium.org/147713002/)

Reason for revert:
broke http://108.170.217.252:10115/builders/Build-Mac10.8-Clang-x86_64-Release/builds/2908/steps/Retry_BuildTests/logs/stdio and other builders:

GrRedBlackTreeTest.cpp:24:36: error: use of undeclared identifier 'xi'

Original issue's description:
> Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT().
>
> This fixes the mtklein's TODO in GrUnitTests.cpp.
>
> BUG=None
> TEST=out/Debug/tests
> R=mtklein@google.com, robertphillips@google.com
>
> Committed: https://code.google.com/p/skia/source/detail?r=13208

R=mtklein@google.com, robertphillips@google.com, reed@google.com, tfarina@chromium.org
TBR=mtklein@google.com, reed@google.com, robertphillips@google.com, tfarina@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=None

Author: epoger@google.com

Review URL: https://codereview.chromium.org/148653002

git-svn-id: http://skia.googlecode.com/svn/trunk@13209 2bbb7eff-a529-9590-31e7-b0007b416f81