Revert of Unified Gesture Recognizer

ui/events/event_switches.cc

 // Copyright 2013 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.
 
 #include "ui/events/event_switches.h"
 
 namespace switches {
 
 // Enable scroll prediction for scroll update events.
 const char kEnableScrollPrediction[] = "enable-scroll-prediction";
 
 // Enable support for touch events.
 const char kTouchEvents[] = "touch-events";
 
 // The values the kTouchEvents switch may have, as in --touch-events=disabled.
 //   auto: enabled at startup when an attached touchscreen is present.
 const char kTouchEventsAuto[] = "auto";
 //   enabled: touch events always enabled.
 const char kTouchEventsEnabled[] = "enabled";
 //   disabled: touch events are disabled.
 const char kTouchEventsDisabled[] = "disabled";
-// Use the unified gesture detector, instead of the aura gesture detector.
-const char kUseUnifiedGestureDetector[] = "use-unified-gesture-detector";
 
 #if defined(OS_LINUX)
 // Tells chrome to interpret events from these devices as touch events. Only
 // available with XInput 2 (i.e. X server 1.8 or above). The id's of the
 // devices can be retrieved from 'xinput list'.
 const char kTouchDevices[] = "touch-devices";
 #endif
 
 #if defined(USE_XI2_MT) || defined(USE_OZONE)
 // The calibration factors given as "<left>,<right>,<top>,<bottom>".
 const char kTouchCalibration[] = "touch-calibration";
 #endif
 
 }  // namespace switches