Completely removing dead code related to history view.

- This CL repurposes the history button above the stack to a more
  generic “stack action” button in preparation for a future change.

Bug: 27742174
Change-Id: I1da274bf88c77bdc09d91072683b2ea7ca022432
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index 091ba51..c9aa714 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -731,10 +731,8 @@
     <string name="recents_launch_error_message">Could not start <xliff:g id="app" example="Calendar">%s</xliff:g>.</string>
     <!-- Recents: Launch disabled string. [CHAR LIMIT=NONE] -->
     <string name="recents_launch_disabled_message"><xliff:g id="app" example="Calendar">%s</xliff:g> is disabled in safe-mode.</string>
-    <!-- Recents: Show history string. [CHAR LIMIT=NONE] -->
-    <string name="recents_history_button_label">History</string>
-    <!-- Recents: History clear all string. [CHAR LIMIT=NONE] -->
-    <string name="recents_history_clear_all_button_label">Clear</string>
+    <!-- Recents: Stack action button string. [CHAR LIMIT=NONE] -->
+    <string name="recents_stack_action_button_label">Clear all</string>
     <!-- Recents: Non-dockable task drag message. [CHAR LIMIT=NONE] -->
     <string name="recents_drag_non_dockable_task_message">This app does not support multi-window</string>
     <!-- Recents: Non-dockable task launch sub header. [CHAR LIMIT=NONE] -->