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The base::AlignedAlloc expects a alignement multiple of sizeof(void*) :

DCHECK_EQ(alignment % sizeof(void*), 0U);

This fixes this error :

[0826/162544:FATAL:aligned_memory.cc(19)] Check failed: alignment % sizeof(void*) == 0U (1 vs. 0)

BUG=647570
TEST=run video_encode_accelerator_unittest on a non ARM platform

Review-Url: https://codereview.chromium.org/2281043002
Cr-Commit-Position: refs/heads/master@{#419124}