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

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

Index: third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
diff --git a/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp b/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
index 74124c9ee9db4cc7a3e5883071a52667af8c6874..fdc669c2ab98df6b9e01cab11e6f541d129d302b 100644
--- a/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
+++ b/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
@@ -24,6 +24,8 @@ class NavigatorShare::ShareClientImpl final
 
   void callback(const String& error);
 
+  void onConnectionError();
+
   DEFINE_INLINE_TRACE() {
     visitor->trace(m_navigator);
     visitor->trace(m_resolver);
@@ -51,6 +53,11 @@ void NavigatorShare::ShareClientImpl::callback(const String& error) {
   }
 }
 
+void NavigatorShare::ShareClientImpl::onConnectionError() {
+  m_resolver->reject(
+      DOMException::create(SecurityError, "WebShare is disabled."));
+}
+
 NavigatorShare::~NavigatorShare() = default;
 
 NavigatorShare& NavigatorShare::from(Navigator& navigator) {
@@ -94,6 +101,8 @@ ScriptPromise NavigatorShare::share(ScriptState* scriptState,
     LocalFrame* frame = doc->frame();
     DCHECK(frame);
     frame->interfaceProvider()->getInterface(mojo::GetProxy(&m_service));
+    m_service.set_connection_error_handler(convertToBaseCallback(WTF::bind(
+        &NavigatorShare::onConnectionError, wrapWeakPersistent(this))));
     DCHECK(m_service);
   }
 
@@ -117,4 +126,12 @@ ScriptPromise NavigatorShare::share(ScriptState* scriptState,
   return from(navigator).share(scriptState, shareData);
 }
 
+void NavigatorShare::onConnectionError() {
+  for (auto& client : m_clients) {
+    client->onConnectionError();
+  }
+  m_clients.clear();
+  m_service.reset();
+}
+
 }  // namespace blink