Avoid style clobbering in setCompositionFromExistingText. (2nd land)

Source/core/editing/InputMethodController.h

Index: Source/core/editing/InputMethodController.h
diff --git a/Source/core/editing/InputMethodController.h b/Source/core/editing/InputMethodController.h
index 571bd41c01fa7c92c76d9913332f32406b047976..67c40c2ae0d11483a60905c391a77d210f6830bd 100644
--- a/Source/core/editing/InputMethodController.h
+++ b/Source/core/editing/InputMethodController.h
@@ -27,6 +27,7 @@
 #define InputMethodController_h
 
 #include "core/CoreExport.h"
+#include "core/dom/Range.h"
 #include "core/editing/CompositionUnderline.h"
 #include "core/editing/EphemeralRange.h"
 #include "core/editing/PlainTextRange.h"
@@ -72,14 +73,8 @@ public:
     EphemeralRange compositionEphemeralRange() const;
     PassRefPtrWillBeRawPtr<Range> compositionRange() const;
 
-    // getting international text input composition state (for use by InlineTextBox)
-    Text* compositionNode() const { return m_compositionNode.get(); }
-    unsigned compositionStart() const { return m_compositionStart; }
-    unsigned compositionEnd() const { return m_compositionEnd; }
-    bool compositionUsesCustomUnderlines() const { return !m_customCompositionUnderlines.isEmpty(); }
-    const Vector<CompositionUnderline>& customCompositionUnderlines() const { return m_customCompositionUnderlines; }
-
     void clear();
+    void documentDetached();
 
     PlainTextRange getSelectionOffsets() const;
     // Returns true if setting selection to specified offsets, otherwise false.
@@ -100,13 +95,9 @@ private:
     friend class SelectionOffsetsScope;
 
     RawPtrWillBeMember<LocalFrame> m_frame;
-    RefPtrWillBeMember<Text> m_compositionNode;
-    // We don't use PlainTextRange which is immutable, for composition range.
-    unsigned m_compositionStart;
-    unsigned m_compositionEnd;
-    // startOffset and endOffset of CompositionUnderline are based on
-    // m_compositionNode.
-    Vector<CompositionUnderline> m_customCompositionUnderlines;
+    RefPtrWillBeMember<Range> m_compositionRange;
+    bool m_isDirty;
+    bool m_hasComposition;
 
     explicit InputMethodController(LocalFrame&);