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

1 files changed, 1 insertions, 1 deletions

diff --git a/bench/MatrixConvolutionBench.cpp b/bench/MatrixConvolutionBench.cpp
index 6302f1273b..05f0193cec 100644
--- a/bench/MatrixConvolutionBench.cpp
+++ b/bench/MatrixConvolutionBench.cpp
@@ -50,7 +50,7 @@ protected:
 
 private:
     typedef Benchmark INHERITED;
-    SkMatrixConvolutionImageFilter* fFilter;
+    SkImageFilter* fFilter;
     SkString fName;
 };