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While migrating ExecutionContext to LocalDOMWindow, several helpers
were introduced on Document (From(), DynamicFrom(),
ToExecutionContext()). This CL removes usage of these types from this
directory.

From() and DynamicFrom() are replaced with the standard
downcast helpers for LocalDOMWindow. ToExecutionContext() is replaced
with a direct path to the LocalDOMWindow, or Node::GetExecutionContext(),
or Document::GetExecutionContext(), whichever is most direct from the
callsite.

Bug: 1029822
Change-Id: I2f027d0fa2553367195e71359234b9a455c599a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112988
Commit-Queue: Nate Chapin <japhet@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762075}