Revert of Convert network hints to Mojo

chrome/renderer/chrome_render_thread_observer.cc

Index: chrome/renderer/chrome_render_thread_observer.cc
diff --git a/chrome/renderer/chrome_render_thread_observer.cc b/chrome/renderer/chrome_render_thread_observer.cc
index 1a92eddc71ba3de01075f1d214527ebec46aaf15..a5752171bff3f0ca5965870051992a74d2bb3c27 100644
--- a/chrome/renderer/chrome_render_thread_observer.cc
+++ b/chrome/renderer/chrome_render_thread_observer.cc
@@ -37,7 +37,6 @@
 #include "chrome/common/url_constants.h"
 #include "chrome/renderer/content_settings_observer.h"
 #include "chrome/renderer/security_filter_peer.h"
-#include "components/network_hints/renderer/prescient_networking_dispatcher.h"
 #include "content/public/child/resource_dispatcher_delegate.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
@@ -236,10 +235,7 @@
 bool ChromeRenderThreadObserver::is_incognito_process_ = false;
 
 ChromeRenderThreadObserver::ChromeRenderThreadObserver()
-    : field_trial_syncer_(this),
-      prescient_networking_dispatcher_(
-          new network_hints::PrescientNetworkingDispatcher()),
-      weak_factory_(this) {
+    : field_trial_syncer_(this), weak_factory_(this) {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
@@ -287,10 +283,6 @@
   return handled;
 }
 
-void ChromeRenderThreadObserver::OnRenderProcessShutdown() {
-  prescient_networking_dispatcher_.reset();
-}
-
 void ChromeRenderThreadObserver::OnFieldTrialGroupFinalized(
     const std::string& trial_name,
     const std::string& group_name) {