Touch event flag should control only DOM event firing.

content/browser/web_contents/web_contents_view_aura_browsertest.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_view_aura.h"
 
 #include <stddef.h>
 #include <tuple>
 
 #include "base/command_line.h"
@@ skipping 258 matching lines @@
         static_cast<WebContentsImpl*>(shell()->web_contents());
     NavigationControllerImpl* controller = &web_contents->GetController();
 
     screenshot_manager_ = new ScreenshotTracker(controller);
     controller->SetScreenshotManager(base::WrapUnique(screenshot_manager_));
 
     frame_watcher_ = new FrameWatcher();
     frame_watcher_->AttachTo(shell()->web_contents());
   }
 
-  void SetUpCommandLine(base::CommandLine* cmd) override {
-    cmd->AppendSwitchASCII(switches::kTouchEvents,
-                           switches::kTouchEventsEnabled);
-  }
-
   void TestOverscrollNavigation(bool touch_handler) {
     ASSERT_NO_FATAL_FAILURE(StartTestWithPage("/overscroll_navigation.html"));
     WebContentsImpl* web_contents =
         static_cast<WebContentsImpl*>(shell()->web_contents());
     NavigationController& controller = web_contents->GetController();
     RenderFrameHost* main_frame = web_contents->GetMainFrame();
 
     EXPECT_FALSE(controller.CanGoBack());
     EXPECT_FALSE(controller.CanGoForward());
     int index = -1;
@@ skipping 832 matching lines @@
     details = dispatcher->OnEventFromSource(&release);
     ASSERT_FALSE(details.dispatcher_destroyed);
     WaitAFrame();
 
     EXPECT_LT(0, tracker.num_overscroll_updates());
     EXPECT_FALSE(tracker.overscroll_completed());
   }
 }
 
 }  // namespace content