Don't expose webshare from the browser when the origin trial disables it.

third_party/WebKit/Source/modules/webshare/NavigatorShare.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NavigatorShare_h
 #define NavigatorShare_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptWrappable.h"
@@ skipping 25 matching lines @@
   static ScriptPromise share(ScriptState*, Navigator&, const ShareData&);
 
   DECLARE_TRACE();
 
  private:
   class ShareClientImpl;
 
   NavigatorShare();
   static const char* supplementName();
 
+  void onConnectionError();
+
   blink::mojom::blink::ShareServicePtr m_service;
 
   HeapHashSet<Member<ShareClientImpl>> m_clients;
 };
 
 }  // namespace blink
 
 #endif  // NavigatorShare_h