Remove RenderFrameHost pointer from ChooserController.

chrome/browser/usb/usb_chooser_context.cc

Index: chrome/browser/usb/usb_chooser_context.cc
diff --git a/chrome/browser/usb/usb_chooser_context.cc b/chrome/browser/usb/usb_chooser_context.cc
index 231853d9b712a89f90718a7cebc70adc70851a2f..af54a609c06f53f66688a56141da94fe94131595 100644
--- a/chrome/browser/usb/usb_chooser_context.cc
+++ b/chrome/browser/usb/usb_chooser_context.cc
@@ -54,7 +54,8 @@ bool CanStorePersistentEntry(const scoped_refptr<const UsbDevice>& device) {
 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_);
@@ -183,6 +184,10 @@ bool UsbChooserContext::HasDevicePermission(
   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) &&