Remove RenderFrameHost pointer from ChooserController.

chrome/browser/usb/usb_chooser_context.cc

 // 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 "chrome/browser/usb/usb_chooser_context.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 36 matching lines @@
 
 bool CanStorePersistentEntry(const scoped_refptr<const UsbDevice>& device) {
   return !device->serial_number().empty();
 }
 
 }  // namespace
 
 UsbChooserContext::UsbChooserContext(Profile* profile)
     : ChooserContextBase(profile, CONTENT_SETTINGS_TYPE_USB_CHOOSER_DATA),
       is_incognito_(profile->IsOffTheRecord()),
-      observer_(this) {
+      observer_(this),
+      weak_factory_(this) {
   usb_service_ = device::DeviceClient::Get()->GetUsbService();
   if (usb_service_)
     observer_.Add(usb_service_);
 }
 
 UsbChooserContext::~UsbChooserContext() {}
 
 std::vector<std::unique_ptr<base::DictionaryValue>>
 UsbChooserContext::GetGrantedObjects(const GURL& requesting_origin,
                                      const GURL& embedding_origin) {
@@ skipping 108 matching lines @@
         device->product_id() == product_id &&
         device_dict->GetString(kSerialNumberKey, &serial_number) &&
         device->serial_number() == serial_number) {
       return true;
     }
   }
 
   return false;
 }
 
+base::WeakPtr<UsbChooserContext> UsbChooserContext::AsWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 bool UsbChooserContext::IsValidObject(const base::DictionaryValue& object) {
   return object.size() == 4 && object.HasKey(kDeviceNameKey) &&
          object.HasKey(kVendorIdKey) && object.HasKey(kProductIdKey) &&
          object.HasKey(kSerialNumberKey);
 }
 
 void UsbChooserContext::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {
   for (auto& map_entry : ephemeral_devices_)
     map_entry.second.erase(device->guid());
 }