ChromeOS OOBE: display icons specific to screen DPI.

chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css

Index: chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css
diff --git a/chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css b/chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css
index 85832528228282bd91a51d4117fd6a32c9698d18..ea5541efb890247b54166dca58354c78528426fb 100644
--- a/chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css
+++ b/chrome/browser/resources/chromeos/login/oobe_dialog_parameters.css
@@ -5,7 +5,7 @@
 iron-icon.oobe-icon {
   --iron-icon-height: 32px;
   --iron-icon-width: 32px;
-  color: var(--google-blue-500);
+  --iron-icon-fill-color: var(--google-blue-500);
 }
 
 oobe-dialog .header {
@@ -29,3 +29,15 @@ oobe-dialog .subtitle {
 oobe-dialog .bottom-buttons {
   width: 100%
 }
+
+@media all and (-webkit-max-device-pixel-ratio: 1.5) {
+  iron-icon.oobe-icon-2x {
+    display: none;
+  }
+}
+
+@media all and (-webkit-min-device-pixel-ratio: 1.5) {
+  iron-icon.oobe-icon-1x {
+    display: none;
+  }
+}