Revert of fix misc asserts and checks found by fuzzer

src/effects/SkAlphaThresholdFilter.cpp

Index: src/effects/SkAlphaThresholdFilter.cpp
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 406797084f7f8a4369f6087106572a41be817e5d..79520602b719e69f169f7511415861e3d390f12f 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -45,19 +45,11 @@
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkAlphaThresholdFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
 
-static bool outside_unit(SkScalar x) {
-    return x < 0 || x > 1;
-}
 
 SkImageFilter* SkAlphaThresholdFilter::Create(const SkRegion& region,
                                               SkScalar innerThreshold,
                                               SkScalar outerThreshold,
                                               SkImageFilter* input) {
-    if (outside_unit(innerThreshold) || outside_unit(outerThreshold) ||
-        innerThreshold > outerThreshold)
-    {
-        return nullptr;
-    }
     return new SkAlphaThresholdFilterImpl(region, innerThreshold, outerThreshold, input);
 }
 
@@ -342,6 +334,7 @@
 bool SkAlphaThresholdFilterImpl::onFilterImageDeprecated(Proxy* proxy, const SkBitmap& src,
                                                          const Context& ctx, SkBitmap* dst,
                                                          SkIPoint* offset) const {
+    SkASSERT(src.colorType() == kN32_SkColorType);
 
     if (src.colorType() != kN32_SkColorType) {
         return false;