Make keyboard controller a singleton.

chrome/browser/chromeos/input_method/input_method_engine.cc

Index: chrome/browser/chromeos/input_method/input_method_engine.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine.cc b/chrome/browser/chromeos/input_method/input_method_engine.cc
index 775f5cecde1f52d389bd878935124fe11fe13bf1..8486238628e758fd32d87b4d4bfaef59d07dfc88 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine.cc
@@ -433,7 +433,7 @@ bool InputMethodEngine::DeleteSurroundingText(int context_id,
 
 void InputMethodEngine::HideInputView() {
   keyboard::KeyboardController* keyboard_controller =
-    ash::Shell::GetInstance()->keyboard_controller();
+    keyboard::KeyboardController::GetInstance();
   if (keyboard_controller) {
     keyboard_controller->HideKeyboard(
         keyboard::KeyboardController::HIDE_REASON_MANUAL);
@@ -492,7 +492,7 @@ void InputMethodEngine::Enable() {
 
   keyboard::SetOverrideContentUrl(input_view_url_);
   keyboard::KeyboardController* keyboard_controller =
-      ash::Shell::GetInstance()->keyboard_controller();
+      keyboard::KeyboardController::GetInstance();
   if (keyboard_controller)
     keyboard_controller->Reload();
 }
@@ -504,7 +504,7 @@ void InputMethodEngine::Disable() {
   GURL empty_url;
   keyboard::SetOverrideContentUrl(empty_url);
   keyboard::KeyboardController* keyboard_controller =
-      ash::Shell::GetInstance()->keyboard_controller();
+      keyboard::KeyboardController::GetInstance();
   if (keyboard_controller)
     keyboard_controller->Reload();
 }