Rename MaximizeMode to TabletMode

ash/display/window_tree_host_manager.cc

Index: ash/display/window_tree_host_manager.cc
diff --git a/ash/display/window_tree_host_manager.cc b/ash/display/window_tree_host_manager.cc
index 4a1629e38721c3270d340ee01df80060f11fc5be..d1c152adf136f03d6a8b46d3d5d423f91f61b81c 100644
--- a/ash/display/window_tree_host_manager.cc
+++ b/ash/display/window_tree_host_manager.cc
@@ -515,7 +515,7 @@ void WindowTreeHostManager::UpdateMouseLocationAfterDisplayChange() {
   // Do not move the cursor if the cursor's location did not change. This avoids
   // moving (and showing) the cursor:
   // - At startup.
-  // - When the device is rotated in maximized mode.
+  // - When the device is rotated in tablet mode.
   // |cursor_display_id_for_restore_| is checked to ensure that the cursor is
   // moved when the cursor's native position does not change but the display
   // that it is on has changed. This occurs when swapping the primary display.