Exclude all-appds divider from a11y announcements

The string is also removed as unused.

Fix: 274540934
Test: manual testing
Change-Id: Ib95b0481c589def7e3a9b8684b9c0028eea023f1

java/res/layout/chooser_az_label_row.xml

diff --git a/java/res/layout/chooser_az_label_row.xml b/java/res/layout/chooser_az_label_row.xml
index baf07ce..0e907c1 100644
--- a/java/res/layout/chooser_az_label_row.xml
+++ b/java/res/layout/chooser_az_label_row.xml
@@ -16,7 +16,7 @@
   -->
 
 <ImageView xmlns:android="http://schemas.android.com/apk/res/android"
-          android:contentDescription="@string/chooser_all_apps_button_label"
+          android:importantForAccessibility="no"
           android:src="@drawable/chooser_row_layer_list"
           android:paddingTop="16dp"
           android:layout_width="match_parent"

java/res/values/strings.xml

diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 65d50a6..4b5367c 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -247,9 +247,6 @@
     <!-- ChooserActivity - No direct share targets are available. [CHAR LIMIT=NONE] -->
     <string name="chooser_no_direct_share_targets">No recommended people to share with</string>
 
-    <!-- ChooserActivity - Alphabetically sorted apps list label. [CHAR LIMIT=NONE] -->
-    <string name="chooser_all_apps_button_label">Apps list</string>
-
      <!-- Prompt for the USB device resolver dialog with warning text for USB device dialogs.  [CHAR LIMIT=200] -->
     <string name="usb_device_resolve_prompt_warn">This app has not been granted record permission but could capture audio through this USB device.</string>