MacViews: Fix behavior of move and select commands when selection direction changes.

ui/views/style/platform_style_mac.mm

Index: ui/views/style/platform_style_mac.mm
diff --git a/ui/views/style/platform_style_mac.mm b/ui/views/style/platform_style_mac.mm
index d10a483690b9f589581efc3ac0d84320fd54fb78..bd683a7b1f6d6da42ca009d41304602829848ec0 100644
--- a/ui/views/style/platform_style_mac.mm
+++ b/ui/views/style/platform_style_mac.mm
@@ -28,6 +28,11 @@
 const CustomButton::NotifyAction PlatformStyle::kMenuNotifyActivationAction =
     CustomButton::NOTIFY_ON_PRESS;
 
+const gfx::SelectionReversedBehavior PlatformStyle::kWordSelectionBehavior =
+    gfx::SELECTION_CARET;
+const gfx::SelectionReversedBehavior PlatformStyle::kLineSelectionBehavior =
+    gfx::SELECTION_EXTEND;
+
 // static
 gfx::ImageSkia PlatformStyle::CreateComboboxArrow(bool is_enabled,
                                                   Combobox::Style style) {