Revert "Add back missing unique key checks when creating CachedBitmap/Image Proxies"
Revert "Add back missing unique key checks when creating CachedBitmap/Image Proxies"

This reverts commit b78dd5d01eb16ae3cb9104ce8c0fa7e861431259.

Reason for revert: possibly breaking chrome roll

Original change's description:
> Add back missing unique key checks when creating CachedBitmap/Image Proxies
> 
> Its possible that this could fix perf regression in Chrome.
> 
> Bug: 811452
> Change-Id: I2d4f7827092b361469586580f0c7c843ab2d5cec
> Reviewed-on: https://skia-review.googlesource.com/114280
> Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

TBR=39df0a804564ccb6cf75f18db79653821f37c1c5@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: I71646befd07bf28442ac3b9225c021cd141bf398
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 811452
Reviewed-on: https://skia-review.googlesource.com/114422
Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

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