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This reverts commit a799e280.

Reason for revert: <Android crashes blocking M-82 crbug.com/1055463>

Original change's description:
> Release GrContext during OnBackgroundCleanup on low end device
> 
> To reduce Gpu memory on low end device, GrContext and associated
> resources should be released. Abandoning GrContext directly results
> in resources associated to theVkDevice becoming lost. It's preferable
> to destroy entire vulkan context during background cleanup and
> re-initialize when chrome is foregrounded.
> 
> Bug: 1048692
> Change-Id: I6bb0740edee72413f0ac083d847d06e4427133ea
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047828
> Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
> Reviewed-by: Peng Huang <penghuang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#742815}

TBR=penghuang@chromium.org,fangzhoug@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1048692
Change-Id: Ice1010228ccade56edbb4b3a7b54ba40cbd8dd22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070663Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744050}