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Clean up crypto import, since uses of crypto::ECPrivateKey were removed in change I153949d11b923131b404ee603a6d885aec57706d

Bug: 1012226
Change-Id: Ic698f872e6441894e4330fb784609aba72d25ee1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161827
Auto-Submit: Naomi Musgrave <nmusgrave@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762034}