Remove workaround for strikethrough text in iOS omnibox

ios/chrome/browser/ui/omnibox/omnibox_view_ios.h

Index: ios/chrome/browser/ui/omnibox/omnibox_view_ios.h
diff --git a/ios/chrome/browser/ui/omnibox/omnibox_view_ios.h b/ios/chrome/browser/ui/omnibox/omnibox_view_ios.h
index 55c199428cb5b4505146ae0850c2a3a5d1b6c636..69c2c48d84ee6100b8ee75859b5f7dda8eabec0e 100644
--- a/ios/chrome/browser/ui/omnibox/omnibox_view_ios.h
+++ b/ios/chrome/browser/ui/omnibox/omnibox_view_ios.h
@@ -176,10 +176,6 @@ class OmniboxViewIOS : public OmniboxView {
   // popup, and then remove this hack.  b/5877366.
   BOOL ignore_popup_updates_;
 
-  // iOS 10.3 fails to apply the strikethrough style unless an extra style is
-  // also applied. See https://crbug.com/699702 for discussion.
-  BOOL use_strikethrough_workaround_;
-
   // Bridges delegate method calls from |field_| to C++ land.
   base::scoped_nsobject<AutocompleteTextFieldDelegate> field_delegate_;