For some vector icons, get the size from the vector definition.

chrome/browser/ui/views/download/download_item_view_md.cc

Index: chrome/browser/ui/views/download/download_item_view_md.cc
diff --git a/chrome/browser/ui/views/download/download_item_view_md.cc b/chrome/browser/ui/views/download/download_item_view_md.cc
index 03c8aab39736401f4e8ade0b5d79c2f3fd6da241..5b60ca8d2ad9e0bbf417da6730cdf086a814f1d9 100644
--- a/chrome/browser/ui/views/download/download_item_view_md.cc
+++ b/chrome/browser/ui/views/download/download_item_view_md.cc
@@ -826,10 +826,10 @@ void DownloadItemViewMd::SetDropdownState(State new_state) {
     return;
 
   // TODO(estade): theme this color instead of using a constant.
-  gfx::ImageSkia image =
-      gfx::CreateVectorIcon(new_state == PUSHED ? gfx::VectorIconId::FIND_NEXT
-                                                : gfx::VectorIconId::FIND_PREV,
-                            16, gfx::kChromeIconGrey);
+  gfx::ImageSkia image = gfx::CreatePrimaryVectorIcon(
+      new_state == PUSHED ? gfx::VectorIconId::FIND_NEXT
+                          : gfx::VectorIconId::FIND_PREV,
+      gfx::kChromeIconGrey);
   dropdown_button_->SetImage(views::CustomButton::STATE_NORMAL, &image);
   dropdown_state_ = new_state;
   SchedulePaint();