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instance and should have been const. Making this change also allowed
for several other methods to pass const SymmetricKey pointers where
previously they were non-const.

SymmetricKey: :GetRawKey() and SymmetricKey::key() did not modify the
Change-Id: I937e477f91870a1026c2c0aaf767a2e7d5e0ed42
Reviewed-on: https://chromium-review.googlesource.com/529746Reviewed-by: Adam Langley <agl@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478693}