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

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 50c656f7c7a6c30490e717e4c25ee2631bfd9119..efac80f038cebb42e1a9c596245d3ee22a346393 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -66681,7 +66681,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>rbyers@chromium.org</owner>
   <summary>
     Tracks whether touch events are enabled. This is based on the touch events

[mustaq, 2016/11/28 18:47:47]

Tracks whether TouchEvents API is enabled. This is based on ...

[sunyunjia, 2016/11/28 21:04:13]

Done.

-    enabled flag.
+    enabled flag and the presence of a touchscreen.
   </summary>
   <details>
     NOTE: This metric was incorrectly recorded on ChromeOS for versions 42
@@ -103212,8 +103212,8 @@ value.
 
 <enum name="TouchEventsState" type="int">
   <int value="0" label="Enabled"/>
-  <int value="1" label="Automatic - enabled (deprecated)"/>
-  <int value="2" label="Automatic - disabled (deprecated)"/>
+  <int value="1" label="Automatic - enabled"/>
+  <int value="2" label="Automatic - disabled"/>
   <int value="3" label="Disabled"/>
 </enum>