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This is a reland of 4fe92e6c

Original change's description:
> [ChromeDriver] Remove unused shadow DOM object cache
>
> ChromeDriver uses object caches for use while calling JavaScript
> functions. The data structure was designed to allow a separate cache for
> each shadow DOM, but that feature was never used, and objects in shadow
> DOMs have always been stored in the main page cache. This CL removes
> unused code, and resolves differences between test expectancies and
> actual code behavior. It prepares for future changes to make the object
> cache standard compliant.
>
> Bug: chromedriver:1461
> Change-Id: I10fcd94a7fd2359cc43fe6bc7241d36647e9d744
> Reviewed-on: https://chromium-review.googlesource.com/c/1485011
> Commit-Queue: John Chen <johnchen@chromium.org>
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#635754}

Bug: chromedriver:1461 chromedriver:2794
Change-Id: Iedd6b7e43eb256d65bf71fec7e66454ceb0f776c
Reviewed-on: https://chromium-review.googlesource.com/c/1490855Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635876}