Avoid style clobbering in setCompositionFromExistingText. (2nd land)

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index cc5be9e9394dd98dd44c97a4300cc0809da1ecc8..6567d99828d48c3a25eb97dfb1a5ad1fb2d1ba0f 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -108,6 +108,7 @@
 #include "core/editing/DragCaretController.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
+#include "core/editing/InputMethodController.h"
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/editing/spellcheck/SpellChecker.h"
@@ -2179,6 +2180,8 @@ void Document::detach(const AttachContext& context)
 
     frameHost()->eventHandlerRegistry().documentDetached(*this);
 
+    m_frame->inputMethodController().documentDetached();
+
     // If this Document is associated with a live DocumentLoader, the
     // DocumentLoader will take care of clearing the FetchContext. Deferring
     // to the DocumentLoader when possible also prevents prematurely clearing