Deprecate memory coordinator v0 related histograms

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 4a165171b1e9e377c04615d56438fcbe639e67c9..4f6a7533e8a9cd4220d1c8b773e08fc5fa0e0e0a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27545,12 +27545,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Memory.Coordinator.StateDuration" units="seconds">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>Time elapsed between the global state changes.</summary>
 </histogram>
 
 <histogram name="Memory.Coordinator.StateOnCriticalNotificationReceived"
     enum="MemoryState">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     The global state of memory coordinator when a critical pressure notification
@@ -27560,6 +27566,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Memory.Coordinator.StateOnModerateNotificationReceived"
     enum="MemoryState">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     The global state of memory coordinator when a moderate pressure notification
@@ -27568,6 +27577,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Memory.Coordinator.TotalPrivate" units="MB">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     The total private working set memory used by the browser and renderer
@@ -27577,6 +27589,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Memory.Coordinator.TrimMemoryLevel.Normal"
     enum="TrimMemoryLevel">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     Android: Records trim memory level when the global state is NORMAL.
@@ -27585,6 +27600,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Memory.Coordinator.TrimMemoryLevel.Suspended"
     enum="TrimMemoryLevel">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     Android: Records trim memory level when the global state is SUSPENDED.
@@ -27593,6 +27611,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Memory.Coordinator.TrimMemoryLevel.Throttled"
     enum="TrimMemoryLevel">
+  <obsolete>
+    Obsolete as of 2/2017
+  </obsolete>
   <owner>bashi@chromium.org</owner>
   <summary>
     Android: Records trim memory level when the global state is THROTTLED.