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

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 6368096fbcc06a638dfaa4586506bff7222391d5..99e8368e7dac2b77d946701e74d0d10f87057b43 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -203,7 +203,11 @@ bool SkMatrixConvolutionImageFilter::onFilterImage(Proxy* proxy,
                                                    const SkMatrix& matrix,
                                                    SkBitmap* result,
                                                    SkIPoint* loc) {
-    SkBitmap src = this->getInputResult(0, proxy, source, matrix, loc);
+    SkBitmap src = source;
+    if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc)) {
+        return false;
+    }
+
     if (src.config() != SkBitmap::kARGB_8888_Config) {
         return false;
     }