wm: Update namespace and header define guards.

src/platform/window_manager/main.cc

Index: src/platform/window_manager/main.cc
diff --git a/src/platform/window_manager/main.cc b/src/platform/window_manager/main.cc
index a6188e73416af6db3c929eeda9c9e94666fd0c3e..c3165ab0c4f7ef35d1e8b03a6ca7e44d38e5019a 100644
--- a/src/platform/window_manager/main.cc
+++ b/src/platform/window_manager/main.cc
@@ -36,11 +36,11 @@ DEFINE_bool(logtostderr, false,
 DEFINE_string(minidump_dir, ".",
               "Directory where crash minidumps should be written");
 
-using chromeos::ClutterInterface;
-using chromeos::MockClutterInterface;
-using chromeos::RealClutterInterface;
-using chromeos::RealXConnection;
-using chromeos::WindowManager;
+using window_manager::ClutterInterface;
+using window_manager::MockClutterInterface;
+using window_manager::RealClutterInterface;
+using window_manager::RealXConnection;
+using window_manager::WindowManager;
 
 // Get the current time in the local time zone as "YYYYMMDD-HHMMSS".
 std::string GetCurrentTimeAsString() {