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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}