Use implicit conversion to FloatRect to remove overloaded filterSize

Source/platform/graphics/filters/FilterEffect.cpp

Index: Source/platform/graphics/filters/FilterEffect.cpp
diff --git a/Source/platform/graphics/filters/FilterEffect.cpp b/Source/platform/graphics/filters/FilterEffect.cpp
index f42c8f4e6e857a9bfb61184eefb6960c80112c3a..e95bd8d14df553ecd6766f5d939a23a961689a25 100644
--- a/Source/platform/graphics/filters/FilterEffect.cpp
+++ b/Source/platform/graphics/filters/FilterEffect.cpp
@@ -70,12 +70,6 @@ bool FilterEffect::isFilterSizeValid(const FloatRect& rect)
     return true;
 }
 
-
-bool FilterEffect::isFilterSizeValid(const IntRect& rect)
-{
-    return isFilterSizeValid(FloatRect(rect));
-}
-
 FloatRect FilterEffect::determineAbsolutePaintRect(const FloatRect& originalRequestedRect)
 {
     FloatRect requestedRect = originalRequestedRect;