WebUSB Android chooser should be closed when "Get help" button is pressed

chrome/browser/ui/android/usb_chooser_dialog_android.cc

Index: chrome/browser/ui/android/usb_chooser_dialog_android.cc
diff --git a/chrome/browser/ui/android/usb_chooser_dialog_android.cc b/chrome/browser/ui/android/usb_chooser_dialog_android.cc
index f1454a314d44453b660396d9320d11a97b9adbab..c049c31933b445442f5b480787000e8151f8b5b4 100644
--- a/chrome/browser/ui/android/usb_chooser_dialog_android.cc
+++ b/chrome/browser/ui/android/usb_chooser_dialog_android.cc
@@ -166,6 +166,11 @@ void UsbChooserDialogAndroid::LoadUsbHelpPage(
     JNIEnv* env,
     const base::android::JavaParamRef<jobject>& obj) {
   OpenUrl(chrome::kChooserUsbOverviewURL);
+  callback_.Run(nullptr);

[Yaron, 2016/04/21 21:45:37]

Just call |Cancel|?

[juncai, 2016/04/21 21:55:07]

Done.

+  callback_.reset();  // Reset |callback_| so that it is only run once.
+  Java_UsbChooserDialog_closeDialog(base::android::AttachCurrentThread(),
+                                    java_dialog_.obj());
+  RecordWebUsbChooserClosure(WEBUSB_CHOOSER_CLOSED_CANCELLED);
 }
 
 // Get a list of devices that can be shown in the chooser bubble UI for