Reset the default value of touch event flag back to "Auto".

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c42000ecd864c84f059209e7a47c507059647573..ae2905b9ffe66de4729a53ced0d6b4f45505c7be 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -135,11 +135,13 @@ const unsigned kOsAll = kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid;
 const unsigned kOsDesktop = kOsMac | kOsWin | kOsLinux | kOsCrOS;
 
 const FeatureEntry::Choice kTouchEventsChoices[] = {
-    { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },
-    { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kTouchEvents,
-        switches::kTouchEventsDisabled },
-    { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, switches::kTouchEvents,
-        switches::kTouchEventsAuto }
+  { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+    switches::kTouchEvents,
+    switches::kTouchEventsEnabled },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+    switches::kTouchEvents,
+    switches::kTouchEventsDisabled }
 };
 
 #if defined(USE_AURA)