"Fix" remaining connection error handlers in Blink

third_party/WebKit/Source/modules/webusb/USB.cpp

 // Copyright 2015 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.
 
 #include "modules/webusb/USB.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/UseCounter.h"
 #include "device/usb/public/interfaces/device.mojom-blink.h"
 #include "modules/EventTargetModules.h"
 #include "modules/webusb/USBConnectionEvent.h"
 #include "modules/webusb/USBDevice.h"
 #include "modules/webusb/USBDeviceFilter.h"
 #include "modules/webusb/USBDeviceRequestOptions.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
 #include "wtf/Functional.h"
 
 namespace usb = device::usb::blink;
 
 namespace blink {
 namespace {
 
 const char kNoServiceError[] = "USB service unavailable.";
 
 usb::DeviceFilterPtr convertDeviceFilter(const USBDeviceFilter& filter) {
@@ skipping 182 matching lines @@
   String guid = deviceInfo->guid;
   USBDevice* device = m_deviceCache.get(guid);
   if (!device)
     device = USBDevice::create(std::move(deviceInfo), nullptr,
                                getExecutionContext());
   dispatchEvent(USBConnectionEvent::create(EventTypeNames::disconnect, device));
   m_deviceCache.remove(guid);
 }
 
 void USB::onDeviceManagerConnectionError() {
+  if (!Platform::current()) {
+    // TODO(rockot): Clean this up once renderer shutdown sequence is fixed.
+    return;
+  }
+
   m_deviceManager.reset();
   for (ScriptPromiseResolver* resolver : m_deviceManagerRequests)
     resolver->reject(DOMException::create(NotFoundError, kNoServiceError));
   m_deviceManagerRequests.clear();
 }
 
 void USB::onChooserServiceConnectionError() {
+  if (!Platform::current()) {
+    // TODO(rockot): Clean this up once renderer shutdown sequence is fixed.
+    return;
+  }
+
   m_chooserService.reset();
   for (ScriptPromiseResolver* resolver : m_chooserServiceRequests)
     resolver->reject(DOMException::create(NotFoundError, kNoServiceError));
   m_chooserServiceRequests.clear();
 }
 
 DEFINE_TRACE(USB) {
   EventTargetWithInlineData::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
   visitor->trace(m_deviceManagerRequests);
   visitor->trace(m_chooserServiceRequests);
   visitor->trace(m_deviceCache);
 }
 
 }  // namespace blink