Remove unused histograms Omnibox.ProgressBar

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 940a002fe71465c80c3e52b7f1484e37fadfa6fb..a046faeb9f1bdd22790aa7d7f4cc6f71314c1ff1 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -46327,6 +46327,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Omnibox.ProgressBarBreakPointUpdateCount"
     units="break point updates">
+  <obselete>
+    Obselete 05/16/2017. Data is not needed anymore.

[mdjones, 2017/05/17 22:31:20]

nit: "Data is unused (crbug.com/719801)."

[huayinz, 2017/05/17 23:01:48]

Done.

+  </obselete>
   <owner>kkimlabs@chromium.org</owner>
   <summary>
     The number of progress bar break point updates from page load started to
@@ -46335,6 +46338,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Omnibox.ProgressBarUpdateCount" units="frame updates">
+  <obselete>
+    Obselete 05/16/2017. Data is not needed anymore.
+  </obselete>
   <owner>kkimlabs@chromium.org</owner>
   <summary>
     The number of progress bar frame updates from page load started to page load