Fix MSVC build on 64-bit

Mostly int<->size_t implicit conversions.

Warning 4366 (The result of the unary '&' operator may be unaligned)
appears in minidump.cc:907, but I don't know why. It looks aligned to me.

Change-Id: I641942adc324f8f9832b20662083dc83498688a8
Reviewed-on: https://chromium-review.googlesource.com/637390
Reviewed-by: Mike Frysinger <vapier@chromium.org>

src/client/windows/unittests/exception_handler_test.cc

@@ -120,7 +120,7 @@ void ExceptionHandlerTest::SetUp() {
   // THe test case name is exposed to use as a c-style string,
   // But we might be working in UNICODE here on Windows.
   int dwRet = MultiByteToWideChar(CP_ACP, 0, test_info->name(),
-                                  strlen(test_info->name()),
+                                  static_cast<int>(strlen(test_info->name())),
                                   test_name_wide,
                                   MAX_PATH);
   if (!dwRet) {