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/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index f23c8e3..d25adea 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -14,8 +14,8 @@
 #include "SkCanvas.h"
 #include "SkClusterator.h"
 #include "SkData.h"
-#include "SkDeflate.h"
 #include "SkDocument.h"
+#include "SkDeflate.h"
 #include "SkImageEncoder.h"
 #include "SkImageFilterPriv.h"
 #include "SkMakeUnique.h"
@@ -29,7 +29,6 @@
 #include "SkScalar.h"
 #include "SkSpecialImage.h"
 #include "SkStream.h"
-#include "SkTo.h"
 #include "SkTypes.h"
 #include "sk_tool_utils.h"