Revert of Avoid style clobbering in setCompositionFromExistingText.

Source/core/editing/markers/DocumentMarkerController.cpp

Index: Source/core/editing/markers/DocumentMarkerController.cpp
diff --git a/Source/core/editing/markers/DocumentMarkerController.cpp b/Source/core/editing/markers/DocumentMarkerController.cpp
index b0040ff6f32e4fc55837210d00959c7c55ff9358..586289842a50a59afdd84a83d12a4009c7118108 100644
--- a/Source/core/editing/markers/DocumentMarkerController.cpp
+++ b/Source/core/editing/markers/DocumentMarkerController.cpp
@@ -69,8 +69,6 @@
         return DocumentMarker::TextMatchMarkerIndex;
     case DocumentMarker::InvisibleSpellcheck:
         return DocumentMarker::InvisibleSpellcheckMarkerIndex;
-    case DocumentMarker::Composition:
-        return DocumentMarker::CompositionMarkerIndex;
     }
 
     ASSERT_NOT_REACHED();
@@ -111,12 +109,6 @@
     for (TextIterator markedText(range->startPosition(), range->endPosition()); !markedText.atEnd(); markedText.advance())
         addMarker(markedText.currentContainer(), DocumentMarker(markedText.startOffsetInCurrentContainer(), markedText.endOffsetInCurrentContainer(), activeMatch));
     // Don't invalidate tickmarks here. TextFinder invalidates tickmarks using a throttling algorithm. crbug.com/6819.
-}
-
-void DocumentMarkerController::addCompositionMarker(const Position& start, const Position& end, Color underlineColor, bool thick, Color backgroundColor)
-{
-    for (TextIterator markedText(start, end); !markedText.atEnd(); markedText.advance())
-        addMarker(markedText.currentContainer(), DocumentMarker(markedText.startOffsetInCurrentContainer(), markedText.endOffsetInCurrentContainer(), underlineColor, thick, backgroundColor));
 }
 
 void DocumentMarkerController::prepareForDestruction()