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Some websites alter basic javascript objects (Promise, Array, Symbol)
in ways that break ChromeDriver. This cl saves the original javascript
objects, and then uses those when making javascript calls.

Unittests were reconfigured to support the 2 SendCommand calls needed in
ConnectIfNecessary.

Bug: chromedriver:3237
Change-Id: Id7375ec78d661c5400f44db4e2e0d4e443cbd8a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947385
Commit-Queue: Tricia Crichton <triciac@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723593}