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 6b808741731215381389a0bf31629d8e69e7061c..b51488ec6c19ba172bb98b24738e132b4b204f10 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.
@@ -1140,7 +1138,7 @@ 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(