Revert of Convert network hints to Mojo

components/network_hints/renderer/renderer_preconnect.h

Index: components/network_hints/renderer/renderer_preconnect.h
diff --git a/components/network_hints/renderer/renderer_preconnect.h b/components/network_hints/renderer/renderer_preconnect.h
index 3830b8abd66fe342a741af4b00fc5b4e46685bb5..39dac9312ba6fe4e4371ccb84a5456fd1b350430 100644
--- a/components/network_hints/renderer/renderer_preconnect.h
+++ b/components/network_hints/renderer/renderer_preconnect.h
@@ -18,7 +18,6 @@
 #define COMPONENTS_NETWORK_HINTS_RENDERER_RENDERER_PRECONNECT_H_
 
 #include "base/macros.h"
-#include "components/network_hints/public/interfaces/network_hints.mojom.h"
 #include "url/gurl.h"
 
 namespace network_hints {
@@ -34,11 +33,6 @@
   void Preconnect(const GURL& url, bool allow_credentials);
 
  private:
-  // Get a connected NetworkHints.
-  mojom::NetworkHints& GetNetworkHints();
-
-  // Don't use directly. Instead call |GetNetworkHints()|.
-  mojom::NetworkHintsPtr network_hints_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererPreconnect);
 };  // class RendererPreconnect