remove fragile assert
remove fragile assert

The assert basically wants the following to always be true (but it aint)

floor(int + 0.5 + float) == floor(0.5 + float) + int

... where int + 0.5 happens first, and then we add the float.

BUG=skia:4825
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1609873003

Review URL: https://codereview.chromium.org/1609873003

Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,tmpvar/skia.cc,tmpvar/skia.cc,google/skia,HalCanary/skia-hc,rubenvb/skia,tmpvar/skia.cc,rubenvb/skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,rubenvb/skia,tmpvar/skia.cc,google/skia,rubenvb/skia,HalCanary/skia-hc,rubenvb/skia,tmpvar/skia.cc,google/skia,tmpvar/skia.cc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,qrealka/skia-hc,HalCanary/skia-hc,qrealka/skia-hc,qrealka/skia-hc,google/skia,qrealka/skia-hc,qrealka/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,tmpvar/skia.cc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,qrealka/skia-hc,qrealka/skia-hc,HalCanary/skia-hc,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,tmpvar/skia.cc,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,google/skia,tmpvar/skia.cc,rubenvb/skia,rubenvb/skia,aosp-mirror/platform_external_skia