Revert of Remove dependency on content from remoting_host.

remoting/host/chromoting_host_context.h

Index: remoting/host/chromoting_host_context.h
diff --git a/remoting/host/chromoting_host_context.h b/remoting/host/chromoting_host_context.h
index af6216acaba1377040d1d3652fda54b81a552dcc..9de7067203243cf9d05cfa6727b71077263523b8 100644
--- a/remoting/host/chromoting_host_context.h
+++ b/remoting/host/chromoting_host_context.h
@@ -8,10 +8,6 @@
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
 
 namespace net {
 class URLRequestContextGetter;
@@ -43,10 +39,7 @@
   // the IO Thread of the browser process).
   // Instead, we re-use the |url_request_context_getter| in the browser process.
   static scoped_ptr<ChromotingHostContext> CreateForChromeOS(
-      scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
-      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
+      scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
 #endif  // defined(OS_CHROMEOS)
 
   ~ChromotingHostContext();