Disable WebUSB detector logic on Windows.

chrome/browser/usb/web_usb_detector_unittest.cc

Index: chrome/browser/usb/web_usb_detector_unittest.cc
diff --git a/chrome/browser/usb/web_usb_detector_unittest.cc b/chrome/browser/usb/web_usb_detector_unittest.cc
index 70b5f4c6ea4386c2164861360ad86c6d28f41a97..dd410a289278e9dd92a7b055d1422952b548b174 100644
--- a/chrome/browser/usb/web_usb_detector_unittest.cc
+++ b/chrome/browser/usb/web_usb_detector_unittest.cc
@@ -17,6 +17,10 @@
 #include "ui/message_center/notification_delegate.h"
 #include "url/gurl.h"
 
+// These tests are disabled because WebUsbDetector::Initialize is a noop on
+// Windows due to jank and hangs caused by enumerating devices.
+// https://crbug.com/656702
+#if !defined(OS_WIN)
 namespace {
 
 // USB device product name.
@@ -399,3 +403,4 @@ TEST_F(WebUsbDetectorTest, ThreeUsbDeviceAddedAndRemovedDifferentOrder) {
   device_client_.usb_service()->RemoveDevice(device_3);
   EXPECT_EQ(nullptr, message_center_->FindVisibleNotificationById(guid_3));
 }
+#endif  // !OS_WIN