Remove SK_SUPPORT_LEGACY_FILTERBOUNDS_RETURN.

It's now-unused.

BUG=skia:5094
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1823243002

Review URL: https://codereview.chromium.org/1823243002

include/core/SkImageFilter.h

diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index e58497d..025c8fd 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -170,12 +170,6 @@
     SkIRect filterBounds(const SkIRect& src, const SkMatrix& ctm,
                          MapDirection = kReverse_MapDirection) const;
 
-#ifdef SK_SUPPORT_LEGACY_FILTERBOUNDS_RETURN
-    /* DEPRECATED */
-    bool filterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst,
-                      MapDirection = kReverse_MapDirection) const;
-#endif
-
     /**
      *  Returns true if the filter can be processed on the GPU.  This is most
      *  often used for multi-pass effects, where intermediate results must be

src/core/SkImageFilter.cpp

diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 1c223a5..edaaa16 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -290,14 +290,6 @@
     return tmp->internal_getBM(result);
 }
 
-#ifdef SK_SUPPORT_LEGACY_FILTERBOUNDS_RETURN
-bool SkImageFilter::filterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst,
-                                 MapDirection direction) const {
-    *dst = filterBounds(src, ctm, direction);
-    return true;
-}
-#endif
-
 SkIRect SkImageFilter::filterBounds(const SkIRect& src, const SkMatrix& ctm,
                                  MapDirection direction) const {
     if (kReverse_MapDirection == direction) {