Move SkTDArray to private.

TBR=reed
Moving to private is good.

Review URL: https://codereview.chromium.org/1707213002
diff --git a/include/pathops/SkPathOps.h b/include/pathops/SkPathOps.h
index 18c7952..fa01788 100644
--- a/include/pathops/SkPathOps.h
+++ b/include/pathops/SkPathOps.h
@@ -8,8 +8,8 @@
 #define SkPathOps_DEFINED
 
 #include "../private/SkTArray.h"
+#include "../private/SkTDArray.h"
 #include "SkPreConfig.h"
-#include "SkTDArray.h"
 
 class SkPath;
 struct SkRect;