Add high DPI assets and update defaults for CrOS find in page bar.

chrome/browser/ui/gtk/find_bar_gtk.cc

Index: chrome/browser/ui/gtk/find_bar_gtk.cc
diff --git a/chrome/browser/ui/gtk/find_bar_gtk.cc b/chrome/browser/ui/gtk/find_bar_gtk.cc
index b00002bfd8d807cc3b98bc3c2b93ccf2d9a638c8..4dac64f3661df6d2c6ea2869e77452ef6bbe0b16 100644
--- a/chrome/browser/ui/gtk/find_bar_gtk.cc
+++ b/chrome/browser/ui/gtk/find_bar_gtk.cc
@@ -250,7 +250,7 @@ void FindBarGtk::InitWidgets() {
 
   find_next_button_.reset(new CustomDrawButton(theme_service_,
       IDR_FINDINPAGE_NEXT, IDR_FINDINPAGE_NEXT_H, IDR_FINDINPAGE_NEXT_H,
-      IDR_FINDINPAGE_NEXT_P, GTK_STOCK_GO_DOWN, GTK_ICON_SIZE_MENU));
+      IDR_FINDINPAGE_NEXT_D, GTK_STOCK_GO_DOWN, GTK_ICON_SIZE_MENU));
   g_signal_connect(find_next_button_->widget(), "clicked",
                    G_CALLBACK(OnClickedThunk), this);
   gtk_widget_set_tooltip_text(find_next_button_->widget(),
@@ -260,7 +260,7 @@ void FindBarGtk::InitWidgets() {
 
   find_previous_button_.reset(new CustomDrawButton(theme_service_,
       IDR_FINDINPAGE_PREV, IDR_FINDINPAGE_PREV_H, IDR_FINDINPAGE_PREV_H,
-      IDR_FINDINPAGE_PREV_P, GTK_STOCK_GO_UP, GTK_ICON_SIZE_MENU));
+      IDR_FINDINPAGE_PREV_D, GTK_STOCK_GO_UP, GTK_ICON_SIZE_MENU));
   g_signal_connect(find_previous_button_->widget(), "clicked",
                    G_CALLBACK(OnClickedThunk), this);
   gtk_widget_set_tooltip_text(find_previous_button_->widget(),