[Extensions Toolbar] Move some popup logic to be platform-agnostic

chrome/browser/extensions/browser_action_test_util.h

Index: chrome/browser/extensions/browser_action_test_util.h
diff --git a/chrome/browser/extensions/browser_action_test_util.h b/chrome/browser/extensions/browser_action_test_util.h
index d09000161115acc63e0b98fa2acf48d7d0eea36c..2ac4698506122855915a120f9628eeaca4e2c6aa 100644
--- a/chrome/browser/extensions/browser_action_test_util.h
+++ b/chrome/browser/extensions/browser_action_test_util.h
@@ -10,6 +10,7 @@
 #include "ui/gfx/native_widget_types.h"
 
 class Browser;
+class ToolbarActionsBar;
 class ToolbarActionsBarDelegate;
 
 namespace gfx {
@@ -81,6 +82,9 @@ class BrowserActionTestUtil {
   // to run.
   bool OverflowedActionButtonWantsToRun();
 
+  // Returns the ToolbarActionsBar.
+  ToolbarActionsBar* GetToolbarActionsBar();
+
   // Returns the minimum allowed size of an extension popup.
   static gfx::Size GetMinPopupSize();