Remove some unused functions in core

Source/core/dom/DocumentMarker.cpp

Index: Source/core/dom/DocumentMarker.cpp
diff --git a/Source/core/dom/DocumentMarker.cpp b/Source/core/dom/DocumentMarker.cpp
index fd99b12e103b1f927747fcfac6962438daba5922..eb7398eea20e7470116f60655230375d16a42e25 100644
--- a/Source/core/dom/DocumentMarker.cpp
+++ b/Source/core/dom/DocumentMarker.cpp
@@ -96,15 +96,6 @@ inline DocumentMarkerTextMatch* toDocumentMarkerTextMatch(DocumentMarkerDetails*
     return 0;
 }
 
-
-DocumentMarker::DocumentMarker()
-    : m_type(Spelling)
-    , m_startOffset(0)
-    , m_endOffset(0)
-    , m_hash(0)
-{
-}
-
 DocumentMarker::DocumentMarker(MarkerType type, unsigned startOffset, unsigned endOffset, const String& description, uint32_t hash)
     : m_type(type)
     , m_startOffset(startOffset)
@@ -123,15 +114,6 @@ DocumentMarker::DocumentMarker(unsigned startOffset, unsigned endOffset, bool ac
 {
 }
 
-DocumentMarker::DocumentMarker(MarkerType type, unsigned startOffset, unsigned endOffset, PassRefPtrWillBeRawPtr<DocumentMarkerDetails> details)
-    : m_type(type)
-    , m_startOffset(startOffset)
-    , m_endOffset(endOffset)
-    , m_details(details)
-    , m_hash(0)
-{
-}
-
 DocumentMarker::DocumentMarker(const DocumentMarker& marker)
     : m_type(marker.type())
     , m_startOffset(marker.startOffset())