Revert "SkTypes: extract SkTo"

This reverts commit 2a2f67592602b18527bc3fd449132d420cd5b62e.

Reason for revert: this appears to be what is holding up the Chrome roll.

Original change's description:
> SkTypes: extract SkTo
>
> Change-Id: I8de790d5013db2105ad885fa2683303d7c250b09
> Reviewed-on: https://skia-review.googlesource.com/133620
> Reviewed-by: Mike Klein <mtklein@google.com>

TBR=mtklein@google.com,halcanary@google.com

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Iafd738aedfb679a23c061a51afe4b98a8d4cdfae
Reviewed-on: https://skia-review.googlesource.com/134504
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/include/private/SkPathRef.h b/include/private/SkPathRef.h
index 5a5a041..5f64f1a 100644
--- a/include/private/SkPathRef.h
+++ b/include/private/SkPathRef.h
@@ -1,3 +1,4 @@
+
 /*
  * Copyright 2012 Google Inc.
  *
@@ -8,16 +9,14 @@
 #ifndef SkPathRef_DEFINED
 #define SkPathRef_DEFINED
 
-#include "SkAtomics.h"
+#include "../private/SkAtomics.h"
+#include "../private/SkTDArray.h"
 #include "SkMatrix.h"
 #include "SkPoint.h"
 #include "SkRRect.h"
 #include "SkRect.h"
 #include "SkRefCnt.h"
-#include "SkTDArray.h"
 #include "SkTemplates.h"
-#include "SkTo.h"
-
 #include <limits>
 
 class SkRBuffer;