Revert "Request specific ANGLE context versions."
Revert "Request specific ANGLE context versions."

This reverts commit 8eeff5ccf3a35a08d38be5f99b0f08c6171d6838.

Reason for revert: Breaking the Win10 ANGLE bots. https://status.skia.org/repo/skia?commit_label=author&filter=search&search_value=ANGLE

Original change's description:
> Request specific ANGLE context versions.
> 
> Using the ANGLE_create_context_backwards_compatible extension, request
> explicit ANGLE context versions to make sure test coverage of context
> versions matches Chrome.
> 
> BUG=skia:10309
> 
> Change-Id: Ifa4a36851a0517b369d094e5707348a20eaf3879
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293339
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Auto-Submit: Geoff Lang <geofflang@google.com>

TBR=bsalomon@google.com,geofflang@google.com

Change-Id: I5be9651bdc5d72fd02049f3280f11fc32213c231
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:10309
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293536
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia