Autofill dropdown icons:

ui/android/java/src/org/chromium/ui/DropdownAdapter.java

Index: ui/android/java/src/org/chromium/ui/DropdownAdapter.java
diff --git a/ui/android/java/src/org/chromium/ui/DropdownAdapter.java b/ui/android/java/src/org/chromium/ui/DropdownAdapter.java
index e4a4a1839f693dae47186e99ea0c1b24bad81ccd..d819d31a9b112afd6a7d0ccaa6d882f69dadd66d 100644
--- a/ui/android/java/src/org/chromium/ui/DropdownAdapter.java
+++ b/ui/android/java/src/org/chromium/ui/DropdownAdapter.java
@@ -88,7 +88,8 @@ public class DropdownAdapter extends ArrayAdapter<DropdownItem> {
         // it doesn't regress.
         // http://crbug.com/429364
         View wrapper = layout.findViewById(R.id.dropdown_label_wrapper);
-        wrapper.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, height));
+        wrapper.setLayoutParams(
+                new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, height, 1));
 
         DropdownItem item = getItem(position);
         TextView labelView = (TextView) layout.findViewById(R.id.dropdown_label);