Make a separate histogram for MatchComplete Final Status'es and

chrome/browser/prerender/prerender_final_status.h

Index: chrome/browser/prerender/prerender_final_status.h
===================================================================
--- chrome/browser/prerender/prerender_final_status.h	(revision 118385)
+++ chrome/browser/prerender/prerender_final_status.h	(working copy)
@@ -30,7 +30,7 @@
   FINAL_STATUS_TOO_MANY_PROCESSES = 15,
   FINAL_STATUS_RATE_LIMIT_EXCEEDED = 16,
   // Obsolete: FINAL_STATUS_PENDING_SKIPPED = 17,
-  FINAL_STATUS_CONTROL_GROUP = 18,
+  // Obsolete: FINAL_STATUS_CONTROL_GROUP = 18,
   FINAL_STATUS_HTML5_MEDIA = 19,
   FINAL_STATUS_SOURCE_RENDER_VIEW_CLOSED = 20,
   FINAL_STATUS_RENDERER_CRASHED = 21,
@@ -49,10 +49,11 @@
   FINAL_STATUS_CROSS_SITE_NAVIGATION_PENDING = 34,
   FINAL_STATUS_DEVTOOLS_ATTACHED = 35,
   FINAL_STATUS_SESSION_STORAGE_NAMESPACE_MISMATCH = 36,
-  FINAL_STATUS_NO_USE_GROUP = 37,
-  FINAL_STATUS_MATCH_COMPLETE_DUMMY = 38,
+  // Obsolete: FINAL_STATUS_NO_USE_GROUP = 37,
+  // Obsolete: FINAL_STATUS_MATCH_COMPLETE_DUMMY = 38,
   FINAL_STATUS_DUPLICATE = 39,
   FINAL_STATUS_OPEN_URL = 40,
+  FINAL_STATUS_WOULD_HAVE_BEEN_USED = 41,
   FINAL_STATUS_MAX,
 };