Make InputMethodEngine to inherit from new added class InputMethodEngineBase.

ui/base/ime/ime_engine_handler_interface.h

Index: ui/base/ime/ime_engine_handler_interface.h
diff --git a/ui/base/ime/ime_engine_handler_interface.h b/ui/base/ime/ime_engine_handler_interface.h
index 27e265a05dabf385777fb16ce1980ffd2e7305c1..6290841b3bd529f8df41d1c6c3ba52412d88553f 100644
--- a/ui/base/ime/ime_engine_handler_interface.h
+++ b/ui/base/ime/ime_engine_handler_interface.h
@@ -95,9 +95,6 @@ class UI_BASE_IME_EXPORT IMEEngineHandlerInterface {
   // Called when the IME is disabled.
   virtual void Disable() = 0;
 
-  // Called when a property is activated or changed.
-  virtual void PropertyActivate(const std::string& property_name) = 0;
-
   // Called when the IME is reset.
   virtual void Reset() = 0;
 
@@ -233,6 +230,9 @@ class UI_BASE_IME_EXPORT IMEEngineHandlerInterface {
     bool is_auxiliary_text_visible;
   };
 
+  // Called when a property is activated or changed.
+  virtual void PropertyActivate(const std::string& property_name) = 0;
+
   // Called when the candidate in lookup table is clicked. The |index| is 0
   // based candidate index in lookup table.
   virtual void CandidateClicked(uint32_t index) = 0;
@@ -270,7 +270,7 @@ class UI_BASE_IME_EXPORT IMEEngineHandlerInterface {
   // Hides the input view window (from API call).
   virtual void HideInputView() = 0;
 
-#endif
+#endif  // defined(OS_CHROMEOS)
 
  protected:
   IMEEngineHandlerInterface() {}