Remove some unused cloud print histograms.

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 f4aebe74288829e29dbd9c25184bbd7098bf180b..244200579b7e1dd1bfefdbb2abb52e2a3ff27f18 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -6968,6 +6968,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="CloudPrint.CapsUpdateInterval" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
+  <owner>vitalybuka@chromium.org</owner>
+  <summary>The amount of time between capabilities updates.</summary>
+</histogram>
+
 <histogram name="CloudPrint.JobHandlerEvent"
     enum="CloudPrintJobHandlerEventType">
   <owner>vitalybuka@chromium.org</owner>
@@ -7022,8 +7030,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="CloudPrint.ServiceProcessSocketLength">
   <obsolete>
-    Deprecated as of 12/2015. Confirm assumption about socket name size.
-    http://crbug.com/466644
+    Removed 12/2015. http://crbug.com/466644
   </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>
@@ -7032,6 +7039,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="CloudPrint.ServiceUtilityCapsFailTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>
     The amount of time used to fail to collect printer capabilities.
@@ -7039,11 +7049,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="CloudPrint.ServiceUtilityCapsTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>The amount of time used to collect printer capabilities.</summary>
 </histogram>
 
 <histogram name="CloudPrint.ServiceUtilityDisconnectTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>
     The amount of time the utility process runs before disconnect.
@@ -7051,11 +7067,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="CloudPrint.ServiceUtilityMetafileFailTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>The amount of time used to fail to generate metafile.</summary>
 </histogram>
 
 <histogram name="CloudPrint.ServiceUtilityMetafileTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
   <owner>vitalybuka@chromium.org</owner>
   <summary>The amount of time used to generate metafile.</summary>
 </histogram>
@@ -7066,6 +7088,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Event counts in ServiceUtilityProcessHost.</summary>
 </histogram>
 
+<histogram name="CloudPrint.ServiceUtilitySemanticCapsFailTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
+  <owner>vitalybuka@chromium.org</owner>
+  <summary>
+    The amount of time used to fail to collect printer capabilities.
+  </summary>
+</histogram>
+
+<histogram name="CloudPrint.ServiceUtilitySemanticCapsTime" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
+  <owner>vitalybuka@chromium.org</owner>
+  <summary>The amount of time used to collect printer capabilities.</summary>
+</histogram>
+
 <histogram name="CloudPrint.SpoolingTime" units="ms">
   <owner>vitalybuka@chromium.org</owner>
   <summary>The amount of time needed to spool print job.</summary>
@@ -7107,6 +7147,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Number of tries before successful ping. 99 means giving up.</summary>
 </histogram>
 
+<histogram name="CloudPrint.XmppTimeout" units="ms">
+  <obsolete>
+    Removed 02/2017. http://crbug.com/643570
+  </obsolete>
+  <owner>vitalybuka@chromium.org</owner>
+  <summary>Xmpp timeout option value provided by server.</summary>
+</histogram>
+
 <histogram name="ComponentUpdater.Calls" enum="ComponentUpdaterCalls">
   <owner>sorin@chromium.org</owner>
   <summary>