Move Push Notification-related histogram ownership from Michael to Peter

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 c93a3e4fde61ad846cfec8685dcc8094dd64d4bc..a23e5d62ba45ee6b9db942e96ef4ee0137f600f4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34978,12 +34978,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Notifications.Icon.FileSize" units="bytes">
-  <owner>mvanouwerkerk@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
   <summary>The number of bytes loaded for a Web Notification icon.</summary>
 </histogram>
 
 <histogram name="Notifications.Icon.LoadFailTime" units="ms">
-  <owner>mvanouwerkerk@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
   <summary>
     The number of milliseconds it took to fail loading an icon for a Web
     Notification.
@@ -34991,7 +34991,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Notifications.Icon.LoadFinishTime" units="ms">
-  <owner>mvanouwerkerk@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
   <summary>
     The number of milliseconds it took to finish successfully loading an icon
     for a Web Notification.
@@ -34999,7 +34999,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Notifications.Icon.ScaleDownTime" units="ms">
-  <owner>mvanouwerkerk@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
   <summary>
     The number of milliseconds it took to scale down an icon for a Web
     Notification.
@@ -44028,7 +44028,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="PushMessaging.DeliveryStatus" enum="PushDeliveryStatus">
   <owner>johnme@google.com</owner>
-  <owner>mvanouwerkerk@google.com</owner>
   <summary>
     When a Service Worker receives a push message, this records whether it was
     successful, or otherwise the type of error encountered.
@@ -44038,7 +44037,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram name="PushMessaging.GetRegistrationStatus"
     enum="PushGetRegistrationStatus">
   <owner>johnme@google.com</owner>
-  <owner>mvanouwerkerk@google.com</owner>
   <summary>
     When a webpage asks for details about its current push messaging
     registration, this records whether the request is successful, or otherwise
@@ -44049,7 +44047,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram name="PushMessaging.RegistrationStatus"
     enum="PushRegistrationStatus">
   <owner>johnme@google.com</owner>
-  <owner>mvanouwerkerk@google.com</owner>
   <summary>
     When a webpage registers for push messaging, this records whether the
     request is successful, or otherwise the type of error encountered.
@@ -44075,7 +44072,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram name="PushMessaging.UnregistrationStatus"
     enum="PushUnregistrationStatus">
   <owner>johnme@google.com</owner>
-  <owner>mvanouwerkerk@google.com</owner>
   <summary>
     When a webpage unregisters from push messaging, this records whether the
     request is successful, or otherwise the type of error encountered.
@@ -44084,7 +44080,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="PushMessaging.UserVisibleStatus" enum="PushUserVisibleStatus">
   <owner>johnme@google.com</owner>
-  <owner>mvanouwerkerk@google.com</owner>
   <summary>
     When a Service Worker receives a push message, this records whether it
     showed user-visible UX (like a notification), or whether we showed a forced