Correct function call to force no focus ring for SearchBoxImageButton

Bug: 1025313
Change-Id: I87631cc98eb6bb4e5dd11ba1a66bd3868c55865e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918269Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715886}

ui/chromeos/search_box/search_box_view_base.cc

@@ -91,7 +91,7 @@ class SearchBoxImageButton : public views::ImageButton {
 
     // Avoid drawing default dashed focus and draw customized focus in
     // OnPaintBackground();
-    SetFocusPainter(nullptr);
+    SetInstallFocusRingOnFocus(false);
 
     SetPaintToLayer();
     layer()->SetFillsBoundsOpaquely(false);