Use AutoThread in ChromotingHostContext & NPAPI plugin.

remoting/host/host_mock_objects.h

Index: remoting/host/host_mock_objects.h
diff --git a/remoting/host/host_mock_objects.h b/remoting/host/host_mock_objects.h
index 1fd3a41c4d2a30360899e0758798f3a86fcae92d..5533ec570864f9f11ffc2813db231587ef304688 100644
--- a/remoting/host/host_mock_objects.h
+++ b/remoting/host/host_mock_objects.h
@@ -85,23 +85,6 @@ class MockContinueWindow : public ContinueWindow {
   MOCK_METHOD0(Hide, void());
 };
 
-class MockChromotingHostContext : public ChromotingHostContext {
- public:
-  MockChromotingHostContext();
-  virtual ~MockChromotingHostContext();
-
-  MOCK_METHOD0(Start, bool());
-  MOCK_METHOD0(Stop, void());
-  MOCK_METHOD0(ui_task_runner, base::SingleThreadTaskRunner*());
-  MOCK_METHOD0(capture_task_runner, base::SingleThreadTaskRunner*());
-  MOCK_METHOD0(encode_task_runner, base::SingleThreadTaskRunner*());
-  MOCK_METHOD0(network_task_runner, base::SingleThreadTaskRunner*());
-  MOCK_METHOD0(io_task_runner, base::SingleThreadTaskRunner*());
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MockChromotingHostContext);
-};
-
 class MockClientSessionEventHandler : public ClientSession::EventHandler {
  public:
   MockClientSessionEventHandler();