Replace EXPECT/ASSERT_DEATH with EXPECT_DEATH_IF_SUPPORTED.

This allows us to remove all the WIN32/MSVC ifdefs in the
various tests.

http://code.google.com/p/ceres-solver/issues/detail?id=55

Change-Id: Ida053e44ea84b6915758318403f3db05325f1226

internal/ceres/graph_test.cc

diff --git a/internal/ceres/graph_test.cc b/internal/ceres/graph_test.cc
index d4ee22d..85b80bf 100644
--- a/internal/ceres/graph_test.cc
+++ b/internal/ceres/graph_test.cc
@@ -83,22 +83,16 @@
   EXPECT_EQ(graph.EdgeWeight(1, 0), 0.5);
 }
 
-// Death tests don't work on Windows.
-// TODO(keir): Figure out why this test doesn't work on Windows.
-#ifndef _WIN32
-
 TEST(Graph, DieOnNonExistentVertex) {
   Graph<int> graph;
   graph.AddVertex(0, 1.0);
   graph.AddVertex(1, 2.0);
   graph.AddEdge(0, 1, 0.5);
 
-  EXPECT_DEATH(graph.VertexWeight(2), "key not found");
-  EXPECT_DEATH(graph.Neighbors(2), "key not found");
+  EXPECT_DEATH_IF_SUPPORTED(graph.VertexWeight(2), "key not found");
+  EXPECT_DEATH_IF_SUPPORTED(graph.Neighbors(2), "key not found");
 }
 
-#endif  // _WIN32
-
 TEST(Graph, NonExistentEdge) {
   Graph<int> graph;
   graph.AddVertex(0, 1.0);