Drop WebCoreInterpolationQualityToSkFilterQuality

Source/platform/graphics/skia/SkiaUtils.h

Index: Source/platform/graphics/skia/SkiaUtils.h
diff --git a/Source/platform/graphics/skia/SkiaUtils.h b/Source/platform/graphics/skia/SkiaUtils.h
index 209e4d492077be3f5b22c92ef1e3d2d76cc6c7e5..e2d1977d9f2f0243e2e7b632cc72c5f2be6ccc35 100644
--- a/Source/platform/graphics/skia/SkiaUtils.h
+++ b/Source/platform/graphics/skia/SkiaUtils.h
@@ -61,13 +61,6 @@ SkColor PLATFORM_EXPORT scaleAlpha(SkColor, float);
 // alpha is in the range [0, 256].
 SkColor PLATFORM_EXPORT scaleAlpha(SkColor, int);
 
-inline SkFilterQuality WebCoreInterpolationQualityToSkFilterQuality(InterpolationQuality quality)
-{
-    // FIXME: this reflects existing client mappings, but should probably
-    // be expanded to map higher level interpolations more accurately.
-    return quality != InterpolationNone ? kLow_SkFilterQuality : kNone_SkFilterQuality;
-}
-
 // Skia has problems when passed infinite, etc floats, filter them to 0.
 inline SkScalar WebCoreFloatToSkScalar(float f)
 {