Remove the unused OffDomainInclusionDetector

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 08205a2f05d3f6cbb08256ce8f2f2383c605af49..d47d2544226c93e8ae36224f9f6b4a3170738f03 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -46769,6 +46769,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="SBOffDomainInclusion2.Abort" enum="ContentResourceType2">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <owner>gab@chromium.org</owner>
   <summary>
     Logs the resource type of each resource request for which the off-domain
@@ -46778,6 +46781,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="SBOffDomainInclusion2.InHistory" enum="ContentResourceType2">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <owner>gab@chromium.org</owner>
   <summary>
     Logs the resource type of each resource request for which the off-domain
@@ -46788,6 +46794,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="SBOffDomainInclusion2.RequestAnalyzed"
     enum="ContentResourceType2">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <owner>gab@chromium.org</owner>
   <summary>
     Logs the resource type of each resource request analyzed by the
@@ -46796,6 +46805,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="SBOffDomainInclusion2.Suspicious" enum="ContentResourceType2">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <owner>gab@chromium.org</owner>
   <summary>
     Logs the resource type of each resource request for which an off-domain
@@ -46805,6 +46817,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="SBOffDomainInclusion2.Whitelisted" enum="ContentResourceType2">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <owner>gab@chromium.org</owner>
   <summary>
     Logs the resource type of each resource request for which the off-domain
@@ -93304,6 +93319,9 @@ To add a new entry, add it with any value and run test to compute valid value.
 </histogram_suffixes>
 
 <histogram_suffixes name="OffDomainInclusionAbortReason" separator=".">
+  <obsolete>
+    Deprecated 2016-05 as the OffDomainInclusionDetector was removed.
+  </obsolete>
   <suffix name="EmptyMainFrameURL" label="The main frame URL was empty."/>
   <suffix name="HistoryLookupFailed"
       label="The lookup to the HistoryService failed."/>