Mark SB2.Delay and SB2.Network as deprecated

SB2.Delay was removed via https://crrev.com/c/847819/
SB2.Network was removed even before that.

Change-Id: Ifea605183c4774deec9ff94a501815c7d14bc94e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623527
Auto-Submit: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662166}

tools/metrics/histograms/histograms.xml

@@ -107628,6 +107628,9 @@ uploading your change for review.
 </histogram>
 
 <histogram name="SB2.Delay" units="ms">
+  <obsolete>
+    Deprecated in M65. Replaced by SB2.NoUserActionResourceLoadingDelay
+  </obsolete>
   <owner>vakh@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
@@ -107640,6 +107643,9 @@ uploading your change for review.
 </histogram>
 
 <histogram name="SB2.Delay.MainFrame" units="ms">
+  <obsolete>
+    Deprecated in M65.
+  </obsolete>
   <owner>vakh@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
@@ -107651,6 +107657,9 @@ uploading your change for review.
 </histogram>
 
 <histogram name="SB2.Delay.Subresource" units="ms">
+  <obsolete>
+    Deprecated in M65.
+  </obsolete>
   <owner>vakh@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
@@ -108053,6 +108062,9 @@ uploading your change for review.
 </histogram>
 
 <histogram name="SB2.Network" units="ms">
+  <obsolete>
+    Deprecated in M65.
+  </obsolete>
   <owner>vakh@chromium.org</owner>
   <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
@@ -108063,7 +108075,8 @@ uploading your change for review.
 
 <histogram name="SB2.NoUserActionResourceLoadingDelay" units="ms"
     expires_after="M77">
-  <owner>yzshen@chromium.org</owner>
+  <owner>vakh@chromium.org</owner>
+  <owner>chrome-safebrowsing-alerts@google.com</owner>
   <summary>
     The total delay, in milliseconds, caused by SafeBrowsing for a resource
     load, if the SafeBrowsing interstitial page is not shown and therefore no