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The LSI allocators previously did not store a copy of the last generated
LSI. As a result, many call sites would have to keep their own copies.

Now that the LSI allocators have their own copies, the call sites can be
updated to no longer store a separate copy.

WindowPortLocal is one such call site.

BUG=759031

Change-Id: I174529bdc83d97fe84f5c6e9ee595b2dd67a4668
Reviewed-on: https://chromium-review.googlesource.com/1034454
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554824}