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/gm/glyph_pos.cpp b/gm/glyph_pos.cpp
index 0da59ac..16cdfca 100644
--- a/gm/glyph_pos.cpp
+++ b/gm/glyph_pos.cpp
@@ -82,10 +82,8 @@
         canvas->scale(3.0f, 3.0f);
         SkMatrix skew;
         skew.setIdentity();
-        skew.setSkewX(SkScalarDiv(8.0f,
-                                  25.0f));
-        skew.setSkewY(SkScalarDiv(2.0f,
-                                  25.0f));
+        skew.setSkewX(8.0f / 25.0f);
+        skew.setSkewY(2.0f / 25.0f);
         canvas->concat(skew);
         drawTestCase(canvas, 1.0f);
         canvas->restore();
@@ -95,11 +93,9 @@
         canvas->save();
         SkMatrix perspective;
         perspective.setIdentity();
-        perspective.setPerspX(-SkScalarDiv(SK_Scalar1, 340.0f));
-        perspective.setSkewX(SkScalarDiv(8.0f,
-                                         25.0f));
-        perspective.setSkewY(SkScalarDiv(2.0f,
-                                         25.0f));
+        perspective.setPerspX(-SkScalarInvert(340));
+        perspective.setSkewX(8.0f / 25.0f);
+        perspective.setSkewY(2.0f / 25.0f);
 
 
         canvas->concat(perspective);