Update and unify nine-patch files for content suggestion and omnibox cards

chrome/android/java/res/layout/toolbar_tablet.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <!-- The toolbar containing the URL bar, back button, and NTP button.
 -->
 
 <org.chromium.chrome.browser.toolbar.ToolbarTablet
     xmlns:android="http://schemas.android.com/apk/res/android"
@@ skipping 35 matching lines @@
             android:contentDescription="@string/accessibility_btn_refresh" />
 
         <org.chromium.chrome.browser.omnibox.LocationBarTablet
             android:id="@+id/location_bar"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_marginBottom="5dp"
             android:layout_marginTop="5dp"
             android:layout_weight="1"
             android:layout_gravity="top|center"
-            android:background="@drawable/textbox"
+            android:background="@drawable/card_single"
             android:paddingEnd="1dp"
             android:paddingStart="2dp" />
 
         <ImageButton
             android:id="@+id/tab_switcher_button"
             style="@style/ToolbarButton"
             android:contentDescription="@string/accessibility_toolbar_btn_tabswitcher_toggle_default"
             android:visibility="gone" />
 
         <FrameLayout
@@ skipping 11 matching lines @@
                 android:id="@+id/menu_badge"
                 style="@style/ToolbarMenuButtonTablet"
                 android:src="@drawable/badge_update_dark"
                 android:contentDescription="@null"
                 android:importantForAccessibility="no"
                 android:visibility="invisible" />
 
         </FrameLayout>
     </LinearLayout>
 </org.chromium.chrome.browser.toolbar.ToolbarTablet>