Move more vector icons into respective directories.

ash/common/system/overview/overview_button_tray.cc

Index: ash/common/system/overview/overview_button_tray.cc
diff --git a/ash/common/system/overview/overview_button_tray.cc b/ash/common/system/overview/overview_button_tray.cc
index badd42cd9dff53763341f1488e05e2b5d6992a4e..4bd5aadfc1498c4b4ca1f3de65ed91a1f4d23046 100644
--- a/ash/common/system/overview/overview_button_tray.cc
+++ b/ash/common/system/overview/overview_button_tray.cc
@@ -15,12 +15,12 @@
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/public/cpp/shelf_types.h"
+#include "ash/resources/vector_icons/vector_icons.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/paint_vector_icon.h"
-#include "ui/gfx/vector_icons_public.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/image_view.h"
 
@@ -44,7 +44,7 @@ OverviewButtonTray::OverviewButtonTray(WmShelf* wm_shelf)
     SetInkDropMode(InkDropMode::ON);
     SetContentsBackground(false);
     gfx::ImageSkia image_md =
-        CreateVectorIcon(gfx::VectorIconId::SHELF_OVERVIEW, kShelfIconColor);
+        CreateVectorIcon(kShelfOverviewIcon, kShelfIconColor);
     icon_->SetImage(image_md);
   } else {
     SetContentsBackground(true);