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This also improves const correctness of FFTFrame.

Bug: 822721
Change-Id: I49668b37b0ecca278ce35af293eee6e324d88f4c
Reviewed-on: https://chromium-review.googlesource.com/962223Reviewed-by: Raymond Toy <rtoy@chromium.org>
Commit-Queue: Eero Häkkinen <eero.hakkinen@intel.com>
Cr-Commit-Position: refs/heads/master@{#544053}