Move WebInputMethodControllerImpl to core/exported/ & break dependencies.

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index 3082bf7c55d41eb82968523d001f1a915a8f6c16..68a8e8252949b3bba7d791f90128552322b9150e 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -71,7 +71,6 @@
 #include "web/CompositorWorkerProxyClientImpl.h"
 #include "web/ContextMenuAllowedScope.h"
 #include "web/WebDevToolsAgentImpl.h"
-#include "web/WebInputMethodControllerImpl.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebPagePopupImpl.h"
 #include "web/WebRemoteFrameImpl.h"
@@ -458,9 +457,11 @@ void WebFrameWidgetImpl::UpdateBaseBackgroundColor() {
   local_root_->GetFrameView()->SetBaseBackgroundColor(BaseBackgroundColor());
 }
 
-WebInputMethodControllerImpl*
+WebInputMethodController*
 WebFrameWidgetImpl::GetActiveWebInputMethodController() const {
-  return WebInputMethodControllerImpl::FromFrame(FocusedLocalFrameInWidget());
+  WebLocalFrameBase* local_frame =
+      WebLocalFrameBase::FromFrame(FocusedLocalFrameInWidget());
+  return local_frame ? local_frame->GetInputMethodController() : nullptr;
 }
 
 void WebFrameWidgetImpl::ScheduleAnimation() {