[Refactor] Replace kFullscreenUsesMinimalChromeKey with WindowState::hide_shelf_when_fullscreen()

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 7c4e26edb5c27a30059c43e8503474935ada17f7..13f90b6ccce4ad03ddcdb869c5c7f869a958fb9a 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -212,9 +212,9 @@ class ASH_EXPORT ShelfLayoutManager :
   // Is the shelf's alignment horizontal?
   bool IsHorizontalAlignment() const;
 
-  // Tests if the browser is currently in fullscreen mode with minimal
-  // Chrome. When minimal Chrome is present the shelf should be displayed.
-  bool FullscreenWithMinimalChrome() const;
+  // Returns true if there is a fullscreen window and the shelf needs to be
+  // hidden for the topmost fullscreen window.
+  bool FullscreenWithHiddenShelf() const;
 
   // Returns a ShelfLayoutManager on the display which has a launcher for
   // given |window|. See RootWindowController::ForLauncher for more info.