Reland of change all factories to return their base-class (patchset #1 id:1 of https://codereview.chromium.org/1540203002/ )

Reason for revert:
chrome changes have landed

Original issue's description:
> Revert of change all factories to return their base-class (patchset #1 id:1 of https://codereview.chromium.org/1535353002/ )
>
> Reason for revert:
> need to update some chrome/blink call-sites
>
> Original issue's description:
> > change all factories to return their base-class
> >
> > will watch DEPS roll to see if there are chrome sites needing updates
> >
> > BUG=skia:
> > GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1535353002
> >
> > TBR=
> >
> > Committed: https://skia.googlesource.com/skia/+/d63f60a36327e9580861205ebb35cade8c49bd34
>
> TBR=
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/2d6ba6690f8951e152d8e793191b14afd52f5506

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

Review URL: https://codereview.chromium.org/1533373002
diff --git a/tests/DashPathEffectTest.cpp b/tests/DashPathEffectTest.cpp
index 6639ec7..f55bcf8 100644
--- a/tests/DashPathEffectTest.cpp
+++ b/tests/DashPathEffectTest.cpp
@@ -18,7 +18,7 @@
     SkScalar intervals[] = { 1.76934361e+36f, 2.80259693e-45f };  // Values from bug.
     const int count = 2;
     SkScalar phase = SK_ScalarInfinity;  // Used to force the bad fInitialDashLength = -1 path.
-    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, count, phase));
+    SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, count, phase));
 
     // nullptr -> refuses to work with flattening framework.
     REPORTER_ASSERT(r, dash->getFactory() != nullptr);
@@ -33,7 +33,7 @@
 
     const SkScalar intervals[] = { 1.0f, 1.0f };
     const int count = 2;
-    SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, count, 0.0f));
+    SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, count, 0.0f));
 
     SkRect cull = SkRect::MakeWH(1.0f, 1.0f);