Remove the unmaintained performance monitor.

content/browser/frame_host/navigator_impl.cc

 // Copyright 2013 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.
 
 #include "content/browser/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
@@ skipping 324 matching lines @@
                  << " characters.";
     return false;
   }
 
   // This will be used to set the Navigation Timing API navigationStart
   // parameter for browser navigations in new tabs (intents, tabs opened through
   // "Open link in new tab"). We need to keep it above RFHM::Navigate() call to
   // capture the time needed for the RenderFrameHost initialization.
   base::TimeTicks navigation_start = base::TimeTicks::Now();
 
-  // WebContents uses this to fill LoadNotificationDetails when the load
-  // completes, so that PerformanceMonitor that listens to the notification can
-  // record the load time. PerformanceMonitor is no longer maintained.
-  // TODO(ppi): make this go away.
-  current_load_start_ = base::TimeTicks::Now();
-
   // Create the navigation parameters.
   FrameMsg_Navigate_Params navigate_params;
   MakeNavigateParams(
       entry, *controller_, reload_type, navigation_start, &navigate_params);
 
   RenderFrameHostManager* manager =
       render_frame_host->frame_tree_node()->render_manager();
 
   // PlzNavigate: the RenderFrameHosts are no longer asked to navigate. Instead
   // the RenderFrameHostManager handles the navigation requests for that frame
@@ skipping 61 matching lines @@
 
 bool NavigatorImpl::NavigateToPendingEntry(
     RenderFrameHostImpl* render_frame_host,
     NavigationController::ReloadType reload_type) {
   return NavigateToEntry(
       render_frame_host,
       *NavigationEntryImpl::FromNavigationEntry(controller_->GetPendingEntry()),
       reload_type);
 }
 
-base::TimeTicks NavigatorImpl::GetCurrentLoadStart() {
-  return current_load_start_;
-}
-
 void NavigatorImpl::DidNavigate(
     RenderFrameHostImpl* render_frame_host,
     const FrameHostMsg_DidCommitProvisionalLoad_Params& input_params) {
   FrameHostMsg_DidCommitProvisionalLoad_Params params(input_params);
   FrameTree* frame_tree = render_frame_host->frame_tree_node()->frame_tree();
   bool use_site_per_process = base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSitePerProcess);
 
   if (use_site_per_process) {
     // TODO(creis): Until we mirror the frame tree in the subframe's process,
@@ skipping 235 matching lines @@
           controller_->GetBrowserContext(), url);
   if ((enabled_bindings & BINDINGS_POLICY_WEB_UI) &&
       !is_allowed_in_web_ui_renderer) {
     // Log the URL to help us diagnose any future failures of this CHECK.
     GetContentClient()->SetActiveURL(url);
     CHECK(0);
   }
 }
 
 }  // namespace content