Remove Net.AuthGenerateToken histograms from histograms.xml

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 2137ef52cbc9a4bd0c0786b80eeda29dd3f9b2ba..2dafd411edb1cd9da84b4c3fbf0490121a6fd5c5 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -14110,16 +14110,25 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Net.AuthGenerateToken_basic" units="milliseconds">
+  <obsolete>
+    Deprecated 01/2011 in https://crrev.com/70740
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>The time to generate a Basic HTTP authentication token.</summary>
 </histogram>
 
 <histogram name="Net.AuthGenerateToken_digest" units="milliseconds">
+  <obsolete>
+    Deprecated 01/2011 in https://crrev.com/70740
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>The time to generate a Digest HTTP authentication token.</summary>
 </histogram>
 
 <histogram name="Net.AuthGenerateToken_negotiate" units="milliseconds">
+  <obsolete>
+    Deprecated 01/2011 in https://crrev.com/70740
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     The time to generate a Negotiate (or SPNEGO) HTTP authentication token.
@@ -14127,6 +14136,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Net.AuthGenerateToken_ntlm" units="milliseconds">
+  <obsolete>
+    Deprecated 01/2011 in https://crrev.com/70740
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>The time to generate an NTLM HTTP authentication token.</summary>
 </histogram>