exo: Fix dragging edge cases

components/exo/wayland/server.cc

Index: components/exo/wayland/server.cc
diff --git a/components/exo/wayland/server.cc b/components/exo/wayland/server.cc
index b26b1f09cca513dd42f5ef0de444519ab265b933..ab310094f745513e151eefd7e9cba9f970a39274 100644
--- a/components/exo/wayland/server.cc
+++ b/components/exo/wayland/server.cc
@@ -1644,7 +1644,7 @@ const struct zcr_notification_surface_v1_interface
 //        |           |
 //        +-----------+
 //
-class WaylandRemoteShell : public WMHelper::MaximizeModeObserver,
+class WaylandRemoteShell : public WMHelper::ShellObserver,
                            public WMHelper::ActivationObserver,
                            public display::DisplayObserver {
  public:
@@ -1653,7 +1653,7 @@ class WaylandRemoteShell : public WMHelper::MaximizeModeObserver,
         remote_shell_resource_(remote_shell_resource),
         weak_ptr_factory_(this) {
     auto* helper = WMHelper::GetInstance();
-    helper->AddMaximizeModeObserver(this);
+    helper->AddShellObserver(this);
     helper->AddActivationObserver(this);
     display::Screen::GetScreen()->AddObserver(this);
 
@@ -1666,7 +1666,7 @@ class WaylandRemoteShell : public WMHelper::MaximizeModeObserver,
   }
   ~WaylandRemoteShell() override {
     auto* helper = WMHelper::GetInstance();
-    helper->RemoveMaximizeModeObserver(this);
+    helper->RemoveShellObserver(this);
     helper->RemoveActivationObserver(this);
     display::Screen::GetScreen()->RemoveObserver(this);
   }
@@ -1716,7 +1716,7 @@ class WaylandRemoteShell : public WMHelper::MaximizeModeObserver,
     }
   }
 
-  // Overridden from WMHelper::MaximizeModeObserver:
+  // Overridden from WMHelper::ShellObserver:
   void OnMaximizeModeStarted() override {
     layout_mode_ = ZCR_REMOTE_SHELL_V1_LAYOUT_MODE_TABLET;
     ScheduleSendDisplayMetrics(kConfigureDelayAfterLayoutSwitchMs);