Size Autocomplete drop down items correctly.

Fit the list item size to the content, and add a small amount of
padding.

Bug: 5420125
Change-Id: I50d6085654be77d1d314efad40df496e9c639c69

Author: Ben Murdoch

core/res/res/layout/web_text_view_dropdown.xml

@@ -23,4 +23,7 @@ limitations under the License.
     android:background="#ffffffff"
     android:singleLine="true"
     android:layout_width="match_parent"
-    android:layout_height="?android:attr/searchResultListItemHeight" />
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeightSmall"
+    android:paddingTop="3dip"
+    android:paddingBottom="3dip" />