Decouple input_method from BrowserThread (and content/).

chrome/browser/chromeos/input_method/ibus_controller.h

Index: chrome/browser/chromeos/input_method/ibus_controller.h
diff --git a/chrome/browser/chromeos/input_method/ibus_controller.h b/chrome/browser/chromeos/input_method/ibus_controller.h
index 7fe9e80b03cf11a64ff5b4c707691b0966c4217c..e0bb50713abec2f7d4eda7582dbfb3c703e25fd1 100644
--- a/chrome/browser/chromeos/input_method/ibus_controller.h
+++ b/chrome/browser/chromeos/input_method/ibus_controller.h
@@ -9,6 +9,12 @@
 #include <utility>
 #include <vector>
 
+#include "base/memory/ref_counted.h"
+
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
+
 namespace chromeos {
 namespace input_method {
 
@@ -30,7 +36,9 @@ class IBusController {
   };
 
   // Creates an instance of the class.
-  static IBusController* Create();
+  static IBusController* Create(
+      const scoped_refptr<base::SequencedTaskRunner>& default_task_runner,
+      const scoped_refptr<base::SequencedTaskRunner>& worker_task_runner);
 
   virtual ~IBusController();