Revert of Convert network hints to Mojo

chrome/renderer/chrome_content_renderer_client.cc

 // Copyright (c) 2012 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 "chrome/renderer/chrome_content_renderer_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 324 matching lines @@
     startup_metric_host->RecordRendererMainEntryTime(main_entry_time_);
   }
 
   chrome_observer_.reset(new ChromeRenderThreadObserver());
   web_cache_impl_.reset(new web_cache::WebCacheImpl());
 
 #if defined(ENABLE_EXTENSIONS)
   ChromeExtensionsRendererClient::GetInstance()->RenderThreadStarted();
 #endif
 
+  prescient_networking_dispatcher_.reset(
+      new network_hints::PrescientNetworkingDispatcher());
 #if defined(ENABLE_SPELLCHECK)
   // ChromeRenderViewTest::SetUp() creates a Spellcheck and injects it using
   // SetSpellcheck(). Don't overwrite it.
   if (!spellcheck_) {
     spellcheck_.reset(new SpellCheck());
     thread->AddObserver(spellcheck_.get());
   }
 #endif
   visited_link_slave_.reset(new visitedlink::VisitedLinkSlave());
 #if defined(FULL_SAFE_BROWSING)
@@ skipping 776 matching lines @@
     const char* canonical_url, size_t length) {
   return visited_link_slave_->ComputeURLFingerprint(canonical_url, length);
 }
 
 bool ChromeContentRendererClient::IsLinkVisited(unsigned long long link_hash) {
   return visited_link_slave_->IsVisited(link_hash);
 }
 
 blink::WebPrescientNetworking*
 ChromeContentRendererClient::GetPrescientNetworking() {
-  return chrome_observer_->prescient_networking_dispatcher();
+  return prescient_networking_dispatcher_.get();
 }
 
 bool ChromeContentRendererClient::ShouldOverridePageVisibilityState(
     const content::RenderFrame* render_frame,
     blink::WebPageVisibilityState* override_state) {
   if (!prerender::PrerenderHelper::IsPrerendering(render_frame))
     return false;
 
   *override_state = blink::WebPageVisibilityStatePrerender;
   return true;
@@ skipping 227 matching lines @@
 // chrome.system.network.getNetworkInterfaces provides the same
 // information. Also, the enforcement of sending and binding UDP is already done
 // by chrome extension permission model.
 bool ChromeContentRendererClient::ShouldEnforceWebRTCRoutingPreferences() {
 #if defined(ENABLE_EXTENSIONS)
   return !IsStandaloneExtensionProcess();
 #else
   return true;
 #endif
 }