Revert of Classify navigations without page id in parallel to the existing classifier.

content/public/common/frame_navigate_params.h

Index: content/public/common/frame_navigate_params.h
diff --git a/content/public/common/frame_navigate_params.h b/content/public/common/frame_navigate_params.h
index 884a1d1b6d2ff76eb9debc05e0ee453d34908f01..b704b8e93066cae1be09fdb882a534f5d2f115c7 100644
--- a/content/public/common/frame_navigate_params.h
+++ b/content/public/common/frame_navigate_params.h
@@ -26,12 +26,6 @@
   // page IDs for user actions, and the old page IDs will be reloaded when
   // iframes are loaded automatically.
   int32 page_id;
-
-  // The unique ID of the NavigationEntry for browser-initiated navigations.
-  // This value was given to the render process in the HistoryNavigationParams
-  // and is being returned by the renderer without it having any idea what it
-  // means. If the navigation was renderer-initiated, this value is 0.
-  int nav_entry_id;
 
   // URL of the page being loaded.
   GURL url;