Revert r333104: "Added UMA statistics for changing the active window via click or touch events."

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 6b9fbb1268b698df005f69f8ea46df64517db0e8..ea94d59b34e2cdf0d46cc197c906c9368af9ad2f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -623,20 +623,6 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
-<histogram name="Ash.Desktop.TimeBetweenNavigateToTaskSwitches" units="seconds">
-  <owner>bruthig@chromium.org</owner>
-  <owner>tdanderson@chromium.org</owner>
-  <summary>
-    The number of seconds between task window activations triggered by users
-    clicking or tapping on a window, as recorded by the Desktop_SwitchTask user
-    action. Recorded on ChromeOS only. Task switches from other sources are
-    ignored and do not affect this metric. In other words, if a user performs
-    the following steps (1) click on task window 'A' (2) Alt+Tab to task 'Z'(3)
-    click on task window 'B', then this will result in a sample recorded for the
-    time delta between activating task window 'A'and 'B'.
-  </summary>
-</histogram>
-
 <histogram name="Ash.Dock.Action" enum="DockedAction">
   <owner>kuscher@google.com</owner>
   <owner>varkha@chromium.org</owner>