wm: Update namespace and header define guards.

src/platform/window_manager/util_test.cc

Index: src/platform/window_manager/util_test.cc
diff --git a/src/platform/window_manager/util_test.cc b/src/platform/window_manager/util_test.cc
index 95370ed25e4ea7ada6f32d98e61f3fe63ff22137..ac1150c8438ae4ddac0aed8257987efa4ade31ff 100644
--- a/src/platform/window_manager/util_test.cc
+++ b/src/platform/window_manager/util_test.cc
@@ -13,7 +13,9 @@
 DEFINE_bool(logtostderr, false,
             "Print debugging messages to stderr (suppressed otherwise)");
 
-namespace chromeos {
+namespace window_manager {
+
+using chromeos::SplitString;
 
 class UtilTest : public ::testing::Test {
  protected:
@@ -141,8 +143,8 @@ TEST_F(UtilTest, ByteMap) {
       width * height);
 }
 
-}  // namespace chromeos
+}  // namespace window_manager
 
 int main(int argc, char **argv) {
-  return chromeos::InitAndRunTests(&argc, argv, &FLAGS_logtostderr);
+  return window_manager::InitAndRunTests(&argc, argv, &FLAGS_logtostderr);
 }