[Payments] Update billing address dropdown style to match the design

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
index fcbed1fb0d60afa8447c07ea37e6e55234370963..eb099cb3da0a1b93df61f03d98a9776eb60cad6a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
@@ -70,8 +70,8 @@ class EditorDropdownField implements EditorFieldView {
         } else {
             adapter = new ArrayAdapter<DropdownKeyValue>(
                     context, R.layout.multiline_spinner_item, dropdownKeyValues);
+            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         }
-        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 
         mDropdown = (Spinner) mLayout.findViewById(R.id.spinner);
         mDropdown.setTag(this);
@@ -92,6 +92,8 @@ class EditorDropdownField implements EditorFieldView {
             @Override
             public void onNothingSelected(AdapterView<?> parent) {}
         });
+        // Remove padding so that dropdown has the same width as the spinner.
+        mDropdown.setPadding(0, 0, 0, 0);
     }
 
     /** @return The View containing everything. */