For PPLT recording, fix order of checks so that matched PPLT for the

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
===================================================================
--- chrome/browser/prerender/prerender_manager.cc	(revision 86506)
+++ chrome/browser/prerender/prerender_manager.cc	(working copy)
@@ -545,12 +545,6 @@
     return false;
   }
 
-  if (prerender_contents->starting_page_id() <=
-      tab_contents->GetMaxPageID()) {
-    prerender_contents.release()->Destroy(FINAL_STATUS_PAGE_ID_CONFLICT);
-    return false;
-  }
-
   // If we are just in the control group (which can be detected by noticing
   // that prerendering hasn't even started yet), record that |tab_contents| now
   // would be showing a prerendered contents, but otherwise, don't do anything.
@@ -559,6 +553,12 @@
     return false;
   }
 
+  if (prerender_contents->starting_page_id() <=
+      tab_contents->GetMaxPageID()) {
+    prerender_contents.release()->Destroy(FINAL_STATUS_PAGE_ID_CONFLICT);
+    return false;
+  }
+
   int child_id, route_id;
   CHECK(prerender_contents->GetChildId(&child_id));
   CHECK(prerender_contents->GetRouteId(&route_id));