Simplify InputMethodWin initialization.

ui/views/controls/textfield/textfield_unittest.cc

Index: ui/views/controls/textfield/textfield_unittest.cc
diff --git a/ui/views/controls/textfield/textfield_unittest.cc b/ui/views/controls/textfield/textfield_unittest.cc
index 2df3dd2800f2e6a10b647b5a1fa7636a6d40f830..371ac1d0b9057497c9eb59159577d44489646c2e 100644
--- a/ui/views/controls/textfield/textfield_unittest.cc
+++ b/ui/views/controls/textfield/textfield_unittest.cc
@@ -76,7 +76,6 @@ class MockInputMethod : public ui::InputMethodBase {
   void CancelComposition(const ui::TextInputClient* client) override;
   void OnInputLocaleChanged() override {}
   std::string GetInputLocale() override;
-  bool IsActive() override;
   bool IsCandidatePopupOpen() const override;
   void ShowImeIfNeeded() override {}
 
@@ -194,10 +193,6 @@ std::string MockInputMethod::GetInputLocale() {
   return "en-US";
 }
 
-bool MockInputMethod::IsActive() {
-  return true;
-}
-
 bool MockInputMethod::IsCandidatePopupOpen() const {
   return false;
 }