Revert "Record time for UI task to execute under 1/60s"

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 adc5ec869adfd134c9525808a633a34dd9dbc012..6a052ba0a099fdfdec32b1d90dc67084839ec88a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -44215,6 +44215,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Startup.FirstWebContents.UINotResponsive" units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the execution time for a single task to execute on UI if
@@ -44226,6 +44229,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Startup.FirstWebContents.UINotResponsive_10sec"
     units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the elapsed time for a single task to execute on UI if it
@@ -44237,6 +44243,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Startup.FirstWebContents.UINotResponsive_1sec"
     units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the elapsed time for a single task to execute on UI if it
@@ -44247,6 +44256,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Startup.FirstWebContents.UIResponsive" units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the elapsed time it takes for a task to execute on UI
@@ -44258,6 +44270,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Startup.FirstWebContents.UIResponsive_10sec"
     units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the elapsed time it takes for a task to execute on UI
@@ -44269,6 +44284,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Startup.FirstWebContents.UIResponsive_1sec"
     units="milliseconds">
+  <obsolete>
+    Deprecated 10/2015.
+  </obsolete>
   <owner>gayane@chromium.org</owner>
   <summary>
     [Desktop] Measures the elapsed time it takes for a task to execute on UI