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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: I208d233652916cbb19b06e24090289995012611c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111066
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@{#761100}