Move WebInputMethodControllerImpl to core/exported/ & break dependencies.

third_party/WebKit/Source/core/exported/WebViewBase.h

Index: third_party/WebKit/Source/core/exported/WebViewBase.h
diff --git a/third_party/WebKit/Source/core/exported/WebViewBase.h b/third_party/WebKit/Source/core/exported/WebViewBase.h
index ed4582968a2cca1024b2f1623fbf0256b3b71325..2f9129c153f03885b8c5c5040672fd8b2f9b09c9 100644
--- a/third_party/WebKit/Source/core/exported/WebViewBase.h
+++ b/third_party/WebKit/Source/core/exported/WebViewBase.h
@@ -33,7 +33,7 @@ class PagePopup;
 class PagePopupClient;
 class PageScaleConstraintsSet;
 class WebInputEvent;
-class WebInputMethodControllerImpl;
+class WebInputMethodController;
 class WebKeyboardEvent;
 class WebLayer;
 class WebLocalFrameBase;
@@ -171,7 +171,7 @@ class WebViewBase : public WebView, public RefCounted<WebViewBase> {
   // corresponding to the focused frame. It will return nullptr if there is no
   // focused frame, or if there is one but it belongs to a different local
   // root.
-  virtual WebInputMethodControllerImpl* GetActiveWebInputMethodController()
+  virtual WebInputMethodController* GetActiveWebInputMethodController()
       const = 0;
   virtual void ScheduleAnimationForWidget() = 0;
   virtual CompositorWorkerProxyClient* CreateCompositorWorkerProxyClient() = 0;