Update toast UI

- lighter background
- no text shadow

bug: 64236136, 64232075
Test: n/a
Change-Id: I4c57cc1f4f30efd6edf7b3cb405f0f7741f7d838

core/res/res/drawable/toast_frame.xml

@@ -17,8 +17,8 @@
 -->
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-    <!-- background is material_grey_300 with .9 alpha -->
-    <solid android:color="#E6E0E0E0" />
+    <!-- background is material_grey_200 with .9 alpha -->
+    <solid android:color="#E6EEEEEE" />
     <corners android:radius="22dp" />
 </shape>
 

core/res/res/layout/transient_notification.xml

@@ -34,8 +34,6 @@
         android:layout_gravity="center_horizontal"
         android:textAppearance="@style/TextAppearance.Toast"
         android:textColor="@color/primary_text_default_material_light"
-        android:shadowColor="#BB000000"
-        android:shadowRadius="2.75"
         />
 
 </LinearLayout>