Update mini_chromium to 222feaf3d302.
Update mini_chromium to 222feaf3d302.

This picks up:

222feaf3d302 Update README
e38cddb83571 Lock: don’t require NativeThreadType to be a pointer type
8c599712d10c Include What You Use: <string.h> for memmove() and memcpy()
ef991f44ed63 Linux: always build in C++11 mode

BUG=crashpad:6
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/812133002

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