Use proper divider asset and margins.

Bug: 3191953
diff --git a/core/res/res/drawable-hdpi/nav_divider.png b/core/res/res/drawable-hdpi/nav_divider.png
deleted file mode 100644
index 7ca3e61..0000000
--- a/core/res/res/drawable-hdpi/nav_divider.png
+++ /dev/null
Binary files differ
diff --git a/core/res/res/drawable-mdpi/nav_divider.png b/core/res/res/drawable-mdpi/nav_divider.png
deleted file mode 100644
index c9413d7..0000000
--- a/core/res/res/drawable-mdpi/nav_divider.png
+++ /dev/null
Binary files differ
diff --git a/core/res/res/layout/fragment_bread_crumb_item.xml b/core/res/res/layout/fragment_bread_crumb_item.xml
index e97508f..dbbb9a5 100644
--- a/core/res/res/layout/fragment_bread_crumb_item.xml
+++ b/core/res/res/layout/fragment_bread_crumb_item.xml
@@ -20,11 +20,12 @@
         >
     <ImageView
             android:id="@android:id/left_icon"
-            android:src="@drawable/nav_divider"
+            android:src="?attr/dividerVertical"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
-            android:layout_marginTop="8dip"
-            android:layout_marginBottom="8dip"
+            android:scaleType="fitXY"
+            android:layout_marginTop="12dip"
+            android:layout_marginBottom="12dip"
         />
 
     <TextView