Fix and enable warning C4244 (Conversion from 'type1' to 'type2', possible loss of data)

Change-Id: I73d9a2b9ad16f032be974b9c819de0dc1247c2ea
Reviewed-on: https://chromium-review.googlesource.com/264533
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/util/random_utils.cpp b/util/random_utils.cpp
index b7b7ae3..e95ae27 100644
--- a/util/random_utils.cpp
+++ b/util/random_utils.cpp
@@ -13,7 +13,7 @@
     static bool randInitialized = false;
     if (!randInitialized)
     {
-        srand(time(NULL));
+        srand(static_cast<unsigned int>(time(NULL)));
         randInitialized = true;
     }