This reverts commit 617cb015.

Reason for revert: Seems to cause rolls in Chromium to fail: https://chromium-review.googlesource.com/c/chromium/src/+/2127135

Original change's description:
> Enable blob cache when debugging
> 
> We've had several issues with shader caches which are only implemented
> on Android which makes them challenging to debug.
> The existing BlobCache object has a default implementation that is
> disabled by default. When debug layers are enabled resize the default
> cache so that it gets used and provides behavior closer to Android.
> This caching will be enabled when debug layers are enabled, e.g.
> EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED_ANGLE attribute is true.
> This is done for angle_end2end_tests and deqp tests.
> 
> Bug: b:152292873
> Change-Id: I9dcd90a1a8da88127bf8dac25031056b7279207e
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2113133
> Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>

TBR=courtneygo@google.com,ianelliott@google.com,jmadill@chromium.org

Change-Id: I42a445b93eff1237b05a82d2836c218b9bbbd08b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:152292873
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2128106Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>