Teach mojo_shell how to load http URLs

mojo/loader/url_request_context_getter.h

Index: mojo/loader/url_request_context_getter.h
diff --git a/mojo/loader/url_request_context_getter.h b/mojo/loader/url_request_context_getter.h
index 521189e6a1b1c5b7739073747ace464c4aba8413..231bf40ecde80d3aaabeed6e7c17ea5b708239e7 100644
--- a/mojo/loader/url_request_context_getter.h
+++ b/mojo/loader/url_request_context_getter.h
@@ -6,6 +6,7 @@
 #define MOJO_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_context_storage.h"
 
@@ -14,7 +15,9 @@ namespace loader {
 
 class URLRequestContextGetter : public net::URLRequestContextGetter {
  public:
-  URLRequestContextGetter();
+  URLRequestContextGetter(
+      base::SingleThreadTaskRunner* network_task_runner,
+      base::MessageLoopProxy* cache_task_runner);
   ~URLRequestContextGetter();
 
   virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE;
@@ -22,6 +25,8 @@ class URLRequestContextGetter : public net::URLRequestContextGetter {
       GetNetworkTaskRunner() const OVERRIDE;
 
  private:
+  scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
+  scoped_refptr<base::MessageLoopProxy> cache_task_runner_;
   scoped_ptr<net::NetLog> net_log_;
   scoped_ptr<net::URLRequestContextStorage> storage_;
   scoped_ptr<net::URLRequestContext> url_request_context_;