Remove resource_context.h include from resource_loader.cc.

content/browser/resource_context_impl.cc

Index: content/browser/resource_context_impl.cc
diff --git a/content/browser/resource_context_impl.cc b/content/browser/resource_context_impl.cc
index 69858783940e07c9987169ec322b1e043f2e9263..cd1b684f13c44464680602d35f15b6efe37783fe 100644
--- a/content/browser/resource_context_impl.cc
+++ b/content/browser/resource_context_impl.cc
@@ -19,7 +19,6 @@
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/keygen_handler.h"
-#include "net/ssl/client_cert_store.h"
 
 using base::UserDataAdapter;
 
@@ -43,10 +42,6 @@ std::string ResourceContext::GetMediaDeviceIDSalt() {
   return media_device_id_salt_;
 }
 
-std::unique_ptr<net::ClientCertStore> ResourceContext::CreateClientCertStore() {
-  return std::unique_ptr<net::ClientCertStore>();
-}
-
 void ResourceContext::CreateKeygenHandler(
     uint32_t key_size_in_bits,
     const std::string& challenge_string,