Use color constant for focus color.

Change-Id: I5213ed065a2ce88c1ee12f94022a2aae726f4a81
diff --git a/res-common/drawable/tab_unselected_focused.xml b/res-common/drawable/tab_unselected_focused.xml
index c32e2c5..13ec95d 100644
--- a/res-common/drawable/tab_unselected_focused.xml
+++ b/res-common/drawable/tab_unselected_focused.xml
@@ -21,7 +21,7 @@
         <shape android:shape="rectangle" >
             <stroke
                 android:width="4dp"
-                android:color="#44ff0000" />
+                android:color="@color/focus_color" />
         </shape>
     </item>
 </layer-list>
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