Update bool WindowManager::OnWmSetBounds() to match with its desirable behavior.

ash/mus/window_manager.cc

Index: ash/mus/window_manager.cc
diff --git a/ash/mus/window_manager.cc b/ash/mus/window_manager.cc
index 21d30e96d708e1a837a5d4a4e57bdfec422a4a1b..e89392c9c0cdac102f36a13abde73b65790b624d 100644
--- a/ash/mus/window_manager.cc
+++ b/ash/mus/window_manager.cc
@@ -304,12 +304,10 @@ void WindowManager::SetWindowManagerClient(ui::WindowManagerClient* client) {
   window_manager_client_ = client;
 }
 
-bool WindowManager::OnWmSetBounds(ui::Window* window, gfx::Rect* bounds) {
+void WindowManager::OnWmSetBounds(ui::Window* window, gfx::Rect* bounds) {
   // TODO(sky): this indirectly sets bounds, which is against what
   // OnWmSetBounds() recommends doing. Remove that restriction, or fix this.
   WmWindowMus::Get(window)->SetBounds(*bounds);
-  *bounds = window->bounds();
-  return true;
 }
 
 bool WindowManager::OnWmSetProperty(