Stop using the Keychain for passwords finally and clean up the Chrome entries there.

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 933ea57125a994c1b3f1a2086bd727ce4ba59c12..812adcd3654bbaeaea1f114dd93b2161127f7ceb 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40122,6 +40122,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram
     name="PasswordManager.KeychainMigration.NumChromeOwnedInaccessiblePasswords">
   <owner>vasilii@chromium.org</owner>
+  <obsolete>
+    Deprecated as of 09/2016.
+  </obsolete>
   <summary>
     After migration from the Mac Keychain fails, records the number of passwords
     in the Keychain owned by Chrome but not accessible by it.
@@ -83819,6 +83822,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Migration succeeded"/>
   <int value="2" label="Migation failed once"/>
   <int value="3" label="Migration failed twice"/>
+  <int value="4" label="Migration succeeded, Keychain cleaned up"/>
+  <int value="5" label="Partial migration"/>
 </enum>
 
 <enum name="KioskLaunchType" type="int">