Remove Close button for chooser bubble and call CloseBubble when Cancel

chrome/browser/usb/usb_chooser_bubble_delegate.cc

Index: chrome/browser/usb/usb_chooser_bubble_delegate.cc
diff --git a/chrome/browser/usb/usb_chooser_bubble_delegate.cc b/chrome/browser/usb/usb_chooser_bubble_delegate.cc
index 6815fab81b5c0c595fa36a58405e109d918e466b..98d8d4b4ba3c76d21c779e1b42b3aba2033dfcba 100644
--- a/chrome/browser/usb/usb_chooser_bubble_delegate.cc
+++ b/chrome/browser/usb/usb_chooser_bubble_delegate.cc
@@ -9,6 +9,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/usb/usb_chooser_context.h"
 #include "chrome/browser/usb/usb_chooser_context_factory.h"
+#include "components/bubble/bubble_controller.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "device/core/device_client.h"
@@ -104,7 +105,10 @@ void UsbChooserBubbleDelegate::Select(int index) {
   callback_.reset();  // Reset |callback_| so that it is only run once.
 }
 
-void UsbChooserBubbleDelegate::Cancel() {}
+void UsbChooserBubbleDelegate::Cancel() {
+  if (bubble_reference_)
+    bubble_reference_->CloseBubble(BUBBLE_CLOSE_CANCELED);
+}
 
 void UsbChooserBubbleDelegate::Close() {}
 
@@ -150,3 +154,8 @@ void UsbChooserBubbleDelegate::GotUsbDeviceList(
   if (observer())
     observer()->OnOptionsInitialized();
 }
+
+void UsbChooserBubbleDelegate::set_bubble_reference(
+    BubbleReference bubble_reference) {
+  bubble_reference_ = bubble_reference;
+}