Make PeopleActivity extends AppCompatActivity (2/3)

This CL is a subset of reversion of ag/870899.

Bug 27687799

Change-Id: I04fa258035ea470b7400ede2e7fce983fb546df0
diff --git a/res-common/layout/search_bar_expanded.xml b/res-common/layout/search_bar_expanded.xml
index c530299..fc088f4 100644
--- a/res-common/layout/search_bar_expanded.xml
+++ b/res-common/layout/search_bar_expanded.xml
@@ -28,7 +28,7 @@
         android:layout_height="@dimen/search_box_icon_size"
         android:layout_margin="@dimen/search_box_navigation_icon_margin"
         android:src="@drawable/ic_back_arrow"
-        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:background="?attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/action_menu_back_from_search"
         android:tint="@color/actionbar_background_color" />
 
@@ -55,7 +55,7 @@
         android:padding="@dimen/search_box_close_icon_padding"
         android:src="@drawable/ic_close_dk"
         android:clickable="true"
-        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:background="?attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/description_clear_search"
         android:tint="@color/searchbox_icon_tint"/>