Rename GetPreferredSize to CalculatePreferredSize in ash/

ash/accelerators/exit_warning_handler.cc

Index: ash/accelerators/exit_warning_handler.cc
diff --git a/ash/accelerators/exit_warning_handler.cc b/ash/accelerators/exit_warning_handler.cc
index 7b8f3c5ac2a2cd4abffff98876e3ba5e3038df9f..917816402b399405e460dd86228ab769fd4e65f1 100644
--- a/ash/accelerators/exit_warning_handler.cc
+++ b/ash/accelerators/exit_warning_handler.cc
@@ -66,7 +66,7 @@ class ExitWarningWidgetDelegateView : public views::WidgetDelegateView {
     SetLayoutManager(new views::FillLayout);
   }
 
-  gfx::Size GetPreferredSize() const override {
+  gfx::Size CalculatePreferredSize() const override {
     return gfx::Size(width_, height_);
   }