Revert of Revert of stop calling SkScalarDiv (patchset #1 id:1 of https://codereview.chromium.org/1138263002/)

Reason for revert:
android patched, blink has rolled

Original issue's description:
> Revert of stop calling SkScalarDiv (patchset #4 id:60001 of https://codereview.chromium.org/1135053002/)
>
> Reason for revert:
> need to wait for Blink roll (and patch android)
>
> Original issue's description:
> > stop calling SkScalarDiv
> >
> > BUG=skia:
> > TBR=
> >
> > Committed: https://skia.googlesource.com/skia/+/67d71c898249a7af3523b16c6a69895a63bfae0a
>
> TBR=
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/2629697933b5cc975e45d2a45c48f803fc6cbcec

TBR=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1135693003
diff --git a/samplecode/SampleStringArt.cpp b/samplecode/SampleStringArt.cpp
index 569fd7f..0e711b0 100644
--- a/samplecode/SampleStringArt.cpp
+++ b/samplecode/SampleStringArt.cpp
@@ -42,7 +42,7 @@
             SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
                                        length*SkScalarSin(step) + center.fY);
             path.lineTo(rp);
-            length += SkScalarDiv(angle, SkScalarHalf(SK_ScalarPI));
+            length += angle / SkScalarHalf(SK_ScalarPI);
             step += angle;
         }
         path.close();