Fixes vertical shelf origin with ChromeVox when shelf is left or right aligned

ash/shelf/shelf_layout_manager.cc

Index: ash/shelf/shelf_layout_manager.cc
diff --git a/ash/shelf/shelf_layout_manager.cc b/ash/shelf/shelf_layout_manager.cc
index aa51bb68d9f7066f8e19ccfb411ee3498d641281..512b88fa38575a97ad9ecccc7c55e693f860f42c 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -809,6 +809,7 @@ void ShelfLayoutManager::CalculateTargetBounds(const State& state,
 
   gfx::Rect available_bounds =
       ScreenUtil::GetShelfDisplayBoundsInRoot(root_window_);
+  available_bounds.Inset(0, chromevox_panel_height_, 0, 0);
   int shelf_width = PrimaryAxisValue(available_bounds.width(), shelf_size);
   int shelf_height = PrimaryAxisValue(shelf_size, available_bounds.height());
   int bottom_shelf_vertical_offset = available_bounds.bottom();