remove unused mode parameter from SkMergeImageFilter

Bug: skia:
Change-Id: Iaa46aaef130a337987c3528685f59c56387d4a7d
Reviewed-on: https://skia-review.googlesource.com/20210
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/bench/ImageFilterDAGBench.cpp b/bench/ImageFilterDAGBench.cpp
index 350510b..aa65a1e 100644
--- a/bench/ImageFilterDAGBench.cpp
+++ b/bench/ImageFilterDAGBench.cpp
@@ -32,13 +32,11 @@
         for (int j = 0; j < loops; j++) {
             sk_sp<SkImageFilter> blur(SkBlurImageFilter::Make(20.0f, 20.0f, nullptr));
             sk_sp<SkImageFilter> inputs[kNumInputs];
-            SkBlendMode modes[kNumInputs];
             for (int i = 0; i < kNumInputs; ++i) {
                 inputs[i] = blur;
-                modes[i] = SkBlendMode::kSrcOver;
             }
             SkPaint paint;
-            paint.setImageFilter(SkMergeImageFilter::MakeN(inputs, kNumInputs, modes));
+            paint.setImageFilter(SkMergeImageFilter::Make(inputs, kNumInputs));
             canvas->drawRect(rect, paint);
         }
     }
@@ -71,12 +69,10 @@
         for (int j = 0; j < loops; j++) {
             sk_sp<SkImageFilter> blur(SkBlurImageFilter::Make(20.0f, 20.0f, nullptr));
             sk_sp<SkImageFilter> inputs[kNumInputs];
-            SkBlendMode modes[kNumInputs];
             for (int i = 0; i < kNumInputs; ++i) {
                 inputs[i] = blur;
-                modes[i] = SkBlendMode::kSrcOver;
             }
-            sk_sp<SkImageFilter> mergeFilter = SkMergeImageFilter::MakeN(inputs, kNumInputs, modes);
+            sk_sp<SkImageFilter> mergeFilter = SkMergeImageFilter::Make(inputs, kNumInputs);
             image = image->makeWithFilter(mergeFilter.get(), subset, subset, &discardSubset,
                                           &offset);
             SkASSERT(image && image->dimensions() == fImage->dimensions());