Revert "Expand texturability testing to cover mip-mapped textures, and fix iOS"

This reverts commit c2b5175e99c6451bdf34fa52900af39ee11a4a84.

Reason for revert: Nexus 5

Original change's description:
> Expand texturability testing to cover mip-mapped textures, and fix iOS
> 
> Don't allow creation of mip-mapped textures when caps says we don't
> support mip-mapping.
> 
> Skip testing of mip-mapped resources in the resource size test,
> when creation will fail.
> 
> For iOS devices with ES2, the APPLE BGRA8888 extension is more
> trouble than it's worth. Even though it lets the internal and
> external formats not match, it appears that the driver remembers
> the first external format, so subsequent attempts to upload with
> the other swizzle will fail. Up until now, creation of these
> textures was failing anyway, so now just make it more explicit
> that we don't support BGRA in this situation.
> 
> Re-land of: https://skia-review.googlesource.com/18261
> 
> BUG=skia:
> 
> Change-Id: I910ffab0aa735647dce910d9054696c385f94933
> Reviewed-on: https://skia-review.googlesource.com/18382
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> 

TBR=bsalomon@google.com,robertphillips@google.com,brianosman@google.com
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=skia:

Change-Id: I8f0fd87678cc584ad37b2a93a859bd4ef38c8092
Reviewed-on: https://skia-review.googlesource.com/18401
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

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