Add --disable-webusb-security flag for testing existing devices.

chrome/common/chrome_switches.h

 // Copyright (c) 2012 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.
 
 // Defines the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
@@ skipping 80 matching lines @@
 extern const char kDisablePopupBlocking[];
 extern const char kDisablePreconnect[];
 extern const char kDisablePrintPreview[];
 extern const char kDisablePromptOnRepost[];
 extern const char kDisablePushApiBackgroundMode[];
 extern const char kDisableQuic[];
 extern const char kDisableQuicPortSelection[];
 extern const char kDisableSessionCrashedBubble[];
 extern const char kDisableSiteEngagementService[];
 extern const char kDisableWebNotificationCustomLayouts[];
+extern const char kDisableWebUsbSecurity[];
 extern const char kDisableZeroBrowsersOpenForTests[];
 extern const char kDiskCacheDir[];
 extern const char kDiskCacheSize[];
 extern const char kDnsLogDetails[];
 extern const char kDnsPrefetchDisable[];
 extern const char kDumpBrowserHistograms[];
 extern const char kEasyUnlockAppPath[];
 extern const char kEnableAddToShelf[];
 extern const char kEnableAppsFileAssociations[];
 extern const char kEnableAudioDebugRecordingsFromExtension[];
@@ skipping 298 matching lines @@
 #if defined(ENABLE_TASK_MANAGER)
 bool NewTaskManagerEnabled();
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_