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/src/pdf/SkPDFShader.cpp b/src/pdf/SkPDFShader.cpp
index c2f0bc4..c627c14 100644
--- a/src/pdf/SkPDFShader.cpp
+++ b/src/pdf/SkPDFShader.cpp
@@ -58,7 +58,7 @@
     // Figure out how to scale each color component.
     SkScalar multiplier[kColorComponents];
     for (int i = 0; i < kColorComponents; i++) {
-        multiplier[i] = SkScalarDiv(curColor[i] - prevColor[i], range);
+        multiplier[i] = (curColor[i] - prevColor[i]) / range;
     }
 
     // Calculate when we no longer need to keep a copy of the input parameter t.
@@ -1132,7 +1132,7 @@
             static const SkScalar kMaxBitmapArea = 1024 * 1024;
             SkScalar bitmapArea = rasterScale * bbox.width() * rasterScale * bbox.height();
             if (bitmapArea > kMaxBitmapArea) {
-                rasterScale *= SkScalarSqrt(SkScalarDiv(kMaxBitmapArea, bitmapArea));
+                rasterScale *= SkScalarSqrt(kMaxBitmapArea / bitmapArea);
             }
 
             SkISize size = SkISize::Make(SkScalarRoundToInt(rasterScale * bbox.width()),