[Chrome OS MD] Update the color of update button and improve its appearance

ash/resources/vector_icons/system_menu_update.icon

Index: ash/resources/vector_icons/system_menu_update.icon
diff --git a/ash/resources/vector_icons/system_menu_update.icon b/ash/resources/vector_icons/system_menu_update.icon
index b1641c9fe05e47d8645296d7dfc00f70e4c3fe4b..1da0254438861057891ca747092ea906772bdd88 100644
--- a/ash/resources/vector_icons/system_menu_update.icon
+++ b/ash/resources/vector_icons/system_menu_update.icon
@@ -5,17 +5,17 @@
 CANVAS_DIMENSIONS, 40,
 MOVE_TO, 20, 36,
 R_CUBIC_TO, 8.84f, 0, 16, -7.16f, 16, -16,
-CUBIC_TO, 36, 11.16f, 28.84f, 4, 20, 4,
-CUBIC_TO, 11.16f, 4, 4, 11.16f, 4, 20,
+CUBIC_TO_SHORTHAND, 28.84f, 4, 20, 4,
+CUBIC_TO_SHORTHAND, 4, 11.16f, 4, 20,
 R_CUBIC_TO, 0, 8.84f, 7.16f, 16, 16, 16,
 CLOSE,
-R_MOVE_TO, -3, -9,
-R_H_LINE_TO, 6,
+R_MOVE_TO, -4, -7,
+R_H_LINE_TO, 8,
 R_V_LINE_TO, -6,
-R_H_LINE_TO, 4,
-R_LINE_TO, -7, -8,
-R_LINE_TO, -7, 8,
-R_H_LINE_TO, 4,
+R_H_LINE_TO, 6,
+LINE_TO, 20, 11,
+LINE_TO, 10, 23,
+R_H_LINE_TO, 6,
 R_V_LINE_TO, 6,
 CLOSE,
 END