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Some web sites (e.g., salesforce.com) modifies the prototype of
AsyncFunction object, causing errors in Execute Script endpoint.
The CL works around this issue by avoid directly using AsyncFunction
object.

Bug: chromedriver:3103
Change-Id: If328aab279bd818f5766381cc537d9612674599c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785738Reviewed-by: Rohan Pavone <rohpavone@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693851}