Get rid of some lingering MD-specific raster assets.

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 dfb7a530b4e172618e958e85f3b213c467117ff1..ec42f0d21298923bcfd3659772340099fb79126e 100644
--- a/chrome/browser/extensions/browser_action_test_util.h
+++ b/chrome/browser/extensions/browser_action_test_util.h
@@ -49,11 +49,6 @@ class BrowserActionTestUtil {
   // Returns the number of browser action currently visible.
   int VisibleBrowserActions();
 
-  // Returns true if the overflow chevron is completely shown in the browser
-  // actions container (i.e., is visible and is within the bounds of the
-  // container).
-  bool IsChevronShowing();
-
   // Inspects the extension popup for the action at the given index.
   void InspectPopup(int index);