win: Avoid warnings about conversion to smaller integer types

win: Avoid warnings about conversion to smaller integer types

e.g.

d:\src\crashpad\crashpad\util\numeric\in_range_cast.h(35) : warning C4244: 'return' : conversion from 'unsigned __int64' to 'uint32_t', possible loss of data
d:\src\crashpad\crashpad\util\numeric\in_range_cast.h(35) : warning C4244: 'return' : conversion from '__int64' to 'int32_t', possible loss of data
        d:\src\crashpad\crashpad\util\numeric\in_range_cast_test.cc(54) : see reference to function template instantiation 'Destination crashpad::InRangeCast<int32_t,__int64>(Source,Destination)' being compiled
        with
        [
            Destination=int32_t
,            Source=__int64
        ]

R=mark@chromium.org
BUG=crashpad:1
Committed: https://chromium.googlesource.com/crashpad/crashpad/+/1a17e7e6434fe883f8d7fc7f3a899c082446b0e2

[Mark Mentovai, 2014-12-15 23:39:23]

LGTM

[scottmg, 2014-12-16 00:19:25]

Patchset #2 (id:20001) has been deleted

[scottmg, 2014-12-16 00:19:37]

Committed patchset #1 (id:1) manually as
1a17e7e6434fe883f8d7fc7f3a899c082446b0e2 (presubmit successful).