[Mac][Material Design] Restore apps page shortcut icon in bookmarks bar.

chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
index 609cba93ac462c197b010a41d95a653d1d777e1f..d950688bea745724d29cd38b477bc62205f52430 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.mm
@@ -453,6 +453,12 @@ BookmarkButton* gDraggedButton = nil; // Weak
   BookmarkBarView* bookmarkBarView =
       base::mac::ObjCCastStrict<BookmarkBarView>([self superview]);
   BookmarkBarController* bookmarkBarController = [bookmarkBarView controller];
+
+  // The apps page shortcut button does not need to be updated.
+  if (self == [bookmarkBarController appsPageShortcutButton]) {
+    return;
+  }
+
   BOOL darkTheme = [[self window] hasDarkTheme];
   NSImage* theImage = nil;
   // Make sure the "off the side" button gets the chevron icon.