Convert network hints to Mojo

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index ec4c0d63c5aebcf8c33f79a300ff42577c472938..8ae31fd768dea7b6ec3cd442813b8e6ed9f376b9 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -342,8 +342,6 @@ void ChromeContentRendererClient::RenderThreadStarted() {
   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.
@@ -1137,7 +1135,7 @@ bool ChromeContentRendererClient::IsLinkVisited(unsigned long long link_hash) {
 
 blink::WebPrescientNetworking*
 ChromeContentRendererClient::GetPrescientNetworking() {
-  return prescient_networking_dispatcher_.get();
+  return chrome_observer_->prescient_networking_dispatcher();
 }
 
 bool ChromeContentRendererClient::ShouldOverridePageVisibilityState(