Remove dead DocumentState metrics tracking code

content/common/navigation_params.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_NAVIGATION_PARAMS_H_
 #define CONTENT_COMMON_NAVIGATION_PARAMS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 199 matching lines @@
 
 // Used by FrameMsg_Navigate. Holds the parameters needed by the renderer to
 // start a browser-initiated navigation besides those in CommonNavigationParams.
 // PlzNavigate: sent to the renderer to make it issue a stream request for a
 // navigation that is ready to commit.
 struct CONTENT_EXPORT RequestNavigationParams {
   RequestNavigationParams();
   RequestNavigationParams(bool is_overriding_user_agent,
                           const std::vector<GURL>& redirects,
                           bool can_load_local_resources,
-                          base::Time request_time,
                           const PageState& page_state,
                           int nav_entry_id,
                           bool is_same_document_history_load,
                           bool is_history_navigation_in_new_child,
                           std::map<std::string, bool> subframe_unique_names,
                           bool has_committed_real_load,
                           bool intended_as_new_entry,
                           int pending_history_list_offset,
                           int current_history_list_offset,
                           int current_history_list_length,
@@ skipping 10 matching lines @@
   // navigations; defaults to empty.
   std::vector<GURL> redirects;
 
   // The ResourceResponseInfos received during redirects.
   std::vector<ResourceResponseInfo> redirect_response;
 
   // Whether or not this url should be allowed to access local file://
   // resources.
   bool can_load_local_resources;
 
-  // The time the request was created. This is used by the old performance
-  // infrastructure to set up DocumentState associated with the RenderView.
-  // TODO(ppi): make it go away.
-  base::Time request_time;
-
   // Opaque history state (received by ViewHostMsg_UpdateState).
   PageState page_state;
 
   // For browser-initiated navigations, this is the unique id of the
   // NavigationEntry being navigated to. (For renderer-initiated navigations it
   // is 0.) If the load succeeds, then this nav_entry_id will be reflected in
   // the resulting FrameHostMsg_DidCommitProvisionalLoad message.
   int nav_entry_id;
 
   // For history navigations, this indicates whether the load will stay within
@@ skipping 82 matching lines @@
   ~NavigationParams();
 
   CommonNavigationParams common_params;
   StartNavigationParams start_params;
   RequestNavigationParams request_params;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_NAVIGATION_PARAMS_H_