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is swapped out => is frozen
for oopif => for child local root frame

"Swapped out" was used in RenderWidget as the term comes from
RenderViewHost, and RenderFrame. The main frame can be swapped out -
meaning hosted in another process. RenderWidget is a separate layer
of the code however and we would like to delete them but we can't,
so they must enter this state of "inactivity". Thus, frozen. Then
we can more clearly separate frozen RenderWidgets from swapped out
frames and freeze/thaw RenderWidgets more appropriately.

"For oopif" is confusing as it seems to mean the RenderWidget is not
in the same frame tree as the main frame. However it can be when
there is an oopif in between the frame in question and the main
frame. Rename it to be more clear about when it is true.

R=ajwong@chromium.org, piman@chromium.org

Change-Id: I52e31acfbf098bfb993d1aea69b699b7bcbb8cbf
Bug: 905191, 419087
Reviewed-on: https://chromium-review.googlesource.com/c/1336218
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608808}