Center the text in the URL bar.

Bug: 3402017
Change-Id: Ibffa709f94e99348c1447a9d4edce0cba7ecaeef
diff --git a/res/layout/url_bar.xml b/res/layout/url_bar.xml
index f8eb03b..526e44c 100644
--- a/res/layout/url_bar.xml
+++ b/res/layout/url_bar.xml
@@ -76,7 +76,6 @@
                 android:layout_width="0dip"
                 android:layout_weight="1.0"
                 android:layout_height="match_parent"
-                android:layout_marginTop="12dip"
                 android:layout_marginLeft="16dip"
                 android:paddingLeft="0dip"
                 android:paddingRight="0dip"