Use IpcVideoFrameCapturer on network thread instead of capturer thread.

remoting/host/ipc_desktop_environment.h

Index: remoting/host/ipc_desktop_environment.h
diff --git a/remoting/host/ipc_desktop_environment.h b/remoting/host/ipc_desktop_environment.h
index c874337e03e57e85e958faed6bd76a26a59dd360..6d8cb7a1190b2e796775732df0efb7e27ce8755f 100644
--- a/remoting/host/ipc_desktop_environment.h
+++ b/remoting/host/ipc_desktop_environment.h
@@ -41,7 +41,6 @@ class IpcDesktopEnvironment : public DesktopEnvironment {
   IpcDesktopEnvironment(
       scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       base::WeakPtr<ClientSessionControl> client_session_control,
       base::WeakPtr<DesktopSessionConnector> desktop_session_connector,
@@ -77,7 +76,6 @@ class IpcDesktopEnvironmentFactory
   IpcDesktopEnvironmentFactory(
       scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       IPC::Sender* daemon_channel);
   ~IpcDesktopEnvironmentFactory() override;
@@ -114,14 +112,11 @@ class IpcDesktopEnvironmentFactory
   // be called.
   scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;
 
-  // Used to run the video capturer.
-  scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
-
   // Task runner used for running background I/O.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // True if curtain mode is enabled.
-  bool curtain_enabled_;
+  bool curtain_enabled_ = false;
 
   // IPC channel connected to the daemon process.
   IPC::Sender* daemon_channel_;
@@ -133,15 +128,15 @@ class IpcDesktopEnvironmentFactory
   // Next desktop session ID. IDs are allocated sequentially starting from 0.
   // This gives us more than 67 years of unique IDs assuming a new ID is
   // allocated every second.
-  int next_id_;
+  int next_id_ = 0;
+
+  // Defines whether desktop environments created by this factory will support
+  // touch events by default.
+  bool supports_touch_events_ = false;
 
   // Factory for weak pointers to DesktopSessionConnector interface.
   base::WeakPtrFactory<DesktopSessionConnector> connector_factory_;
 
-  // If true then the newly Create()ed desktop environments support touch
-  // events.
-  bool supports_touch_events_;
-
   DISALLOW_COPY_AND_ASSIGN(IpcDesktopEnvironmentFactory);
 };