Revert "Check atlasPageCount before accessing the proxy array"
Revert "Check atlasPageCount before accessing the proxy array"

This reverts commit 072c69cad3b50ba3d04ba7a7d6c9dbec50c1cd4f.

Reason for revert: 3000+ seemingly bad gold differences and flutter breakage

Original change's description:
> Check atlasPageCount before accessing the proxy array
> 
> Bug: skia:
> Change-Id: Ib4bca46ea105285f4edea05d78ea4d9ea047d0df
> Reviewed-on: https://skia-review.googlesource.com/128295
> Reviewed-by: Jim Van Verth <jvanverth@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

TBR=jvanverth@google.com,csmartdalton@google.com

Change-Id: Ia568b3884101aeda46e94ef8c6144da3479bc50d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/128420
Reviewed-by: Yuqian Li <5537666080209cb36918c342659e07eb122af24c@google.com>
Commit-Queue: Yuqian Li <5537666080209cb36918c342659e07eb122af24c@google.com>

rubenvb/skia,google/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,HalCanary/skia-hc,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,rubenvb/skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,google/skia,google/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,google/skia,google/skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,rubenvb/skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,google/skia,aosp-mirror/platform_external_skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia