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The ExtensionFunction::GetAssociatedWebContents() method is
unpredictable and can return surprising values in certain circumstances.
It is deprecated and should be removed to ensure that callers are using
the WebContents they expect.

Update the USB API to use GetSenderWebContents() instead.

Bug: 461394

Change-Id: I284a4efc98d878fff0ad48714177467004510d6b
Reviewed-on: https://chromium-review.googlesource.com/1018532Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552250}