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

ui/aura/test/aura_test_base.cc

Index: ui/aura/test/aura_test_base.cc
diff --git a/ui/aura/test/aura_test_base.cc b/ui/aura/test/aura_test_base.cc
index 31b00ae13d90c04ff9384f039f6402164416942c..a3af4ec08b434e0a9ee6243c63fc21a209afcf1f 100644
--- a/ui/aura/test/aura_test_base.cc
+++ b/ui/aura/test/aura_test_base.cc
@@ -156,9 +156,7 @@ void AuraTestBase::OnPointerEventObserved(const ui::PointerEvent& event,
 
 void AuraTestBase::SetWindowManagerClient(WindowManagerClient* client) {}
 
-bool AuraTestBase::OnWmSetBounds(Window* window, gfx::Rect* bounds) {
-  return true;
-}
+void AuraTestBase::OnWmSetBounds(Window* window, const gfx::Rect& bounds) {}
 
 bool AuraTestBase::OnWmSetProperty(
     Window* window,