[Offline pages] Moving disk size related calls to Archive Manager, reorganizing UMA

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 5792258ce98e83db333066e6c4b296268e18be76..a6333b503312182b9f70f4559728b1ae02c3e2f0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34370,6 +34370,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="OfflinePages.DeletePage.FreeSpacePercentage" units="%">
+  <obsolete>
+    Deprecated as of 5/2016. Marginal applicability.
+  </obsolete>
   <owner>jianli@chromium.org</owner>
   <summary>
     The percentage of free space available on the user's device when the page is
@@ -34566,6 +34569,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="OfflinePages.SavePage.FreeSpacePercentage" units="%">
+  <obsolete>
+    Deprecated as of 5/2016. Marginal applicability.
+  </obsolete>
   <owner>jianli@chromium.org</owner>
   <summary>
     The percentage of free space available on the user's device when the page is
@@ -34604,6 +34610,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="OfflinePages.TotalPageSizePercentage" units="%">
+  <obsolete>
+    Deprecated as of 5/2016. Marginal applicability.
+  </obsolete>
   <owner>fgorski@chromium.org</owner>
   <owner>jianli@chromium.org</owner>
   <summary>