Always create URLRequestContextGetter in ChromotingHostContext.

remoting/host/url_fetcher_unittest.cc

Index: remoting/host/url_fetcher_unittest.cc
diff --git a/remoting/host/url_fetcher_unittest.cc b/remoting/host/url_fetcher_unittest.cc
index 614474ec3ad4bc8015f2c13c3befbc08c639141d..811fe419592b116ea525001874850660fc708298 100644
--- a/remoting/host/url_fetcher_unittest.cc
+++ b/remoting/host/url_fetcher_unittest.cc
@@ -31,8 +31,10 @@ class UrlFetcherTest : public testing::Test  {
         base::Thread::Options(MessageLoop::TYPE_IO, 0)));
     ASSERT_TRUE(file_thread_.StartWithOptions(
         base::Thread::Options(MessageLoop::TYPE_IO, 0)));
-    context_getter_ = new URLRequestContextGetter(io_thread_.message_loop(),
-                                                  file_thread_.message_loop());
+    context_getter_ = new URLRequestContextGetter(
+        message_loop_.message_loop_proxy(),
+        io_thread_.message_loop(),
+        static_cast<MessageLoopForIO*>(file_thread_.message_loop()));
     ASSERT_TRUE(test_server_.Start());
   }