crash-reporter: Use integer types from stdint.h

This CL replaces the deprecated int* and uint* types from
'base/basictypes.h' with the int*_t and uint*_t types from 'stdint.h'.

BUG=chromium:401356
TEST=`FEATURES=test emerge-$BOARD platform2`

Change-Id: I33086d64b33ac7d58b578705e95da31e6d6fb5fd
Reviewed-on: https://chromium-review.googlesource.com/211285


Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>