wm: Update namespace and header define guards.

src/platform/window_manager/panel_bar_test.cc

Index: src/platform/window_manager/panel_bar_test.cc
diff --git a/src/platform/window_manager/panel_bar_test.cc b/src/platform/window_manager/panel_bar_test.cc
index 7770c58d399dac6642b697caac962353ad5328be..6442294fe79971737f94ca4d4e77152b60199eb2 100644
--- a/src/platform/window_manager/panel_bar_test.cc
+++ b/src/platform/window_manager/panel_bar_test.cc
@@ -21,7 +21,7 @@
 DEFINE_bool(logtostderr, false,
             "Print debugging messages to stderr (suppressed otherwise)");
 
-namespace chromeos {
+namespace window_manager {
 
 class PanelBarTest : public BasicWindowManagerTest {
  protected:
@@ -176,8 +176,8 @@ TEST_F(PanelBarTest, ActiveWindowMessage) {
   EXPECT_EQ(panel_xid, GetActiveWindowProperty());
 }
 
-}  // 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);
 }