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GetShortData() and IOHIDElementGetUsage() both return uint32s, so raise the size
of various containing types to uint32.

I tried to look in the USB HID spec to see if any of the affected fields here
were limited to e.g. <2^16, meaning that it'd be safe to just cast down to the
existing uint16s instead, but I couldn't find any limits.

BUG=81439
TEST=none

Review URL: https://codereview.chromium.org/656583003

Cr-Commit-Position: refs/heads/master@{#300201}