Remove SkImageFilter::getInputResult(), since its return value is not

src/effects/SkBlurImageFilter.cpp

Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
index 4885070264ea50cd59e32f6e98a83b538db50975..7b68ea0214fafa8967cfa3e3f9cf7da16593b89f 100644
--- a/src/effects/SkBlurImageFilter.cpp
+++ b/src/effects/SkBlurImageFilter.cpp
@@ -137,7 +137,11 @@ static void getBox3Params(SkScalar s, int *kernelSize, int* kernelSize3, int *lo
 bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
                                       const SkBitmap& source, const SkMatrix& ctm,
                                       SkBitmap* dst, SkIPoint* offset) {
-    SkBitmap src = this->getInputResult(0, proxy, source, ctm, offset);
+    SkBitmap src = source;
+    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctm, &src, offset)) {
+        return false;
+    }
+
     if (src.config() != SkBitmap::kARGB_8888_Config) {
         return false;
     }