Remove IME API from Blink

public/web/WebWidget.h

Index: public/web/WebWidget.h
diff --git a/public/web/WebWidget.h b/public/web/WebWidget.h
index 80cc6496b3a50ebc458d82118b35866626377fd1..a75f93894330d2b7c07d3807dd66fe782fe47a7f 100644
--- a/public/web/WebWidget.h
+++ b/public/web/WebWidget.h
@@ -218,13 +218,6 @@ public:
     // If the selection range is empty, it returns the caret bounds.
     virtual bool selectionBounds(WebRect& anchor, WebRect& focus) const { return false; }
 
-    // Called to notify that IME candidate window has changed its visibility or
-    // its appearance. These calls correspond to trigger
-    // candidatewindow{show,update,hide} events defined in W3C IME API.
-    virtual void didShowCandidateWindow() { }
-    virtual void didUpdateCandidateWindow() { }
-    virtual void didHideCandidateWindow() { }
-
     // Returns the text direction at the start and end bounds of the current selection.
     // If the selection range is empty, it returns false.
     virtual bool selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const { return false; }