Make calls to AtomicString(const String&) explicit in dom/

Source/core/dom/SpaceSplitString.cpp

Index: Source/core/dom/SpaceSplitString.cpp
diff --git a/Source/core/dom/SpaceSplitString.cpp b/Source/core/dom/SpaceSplitString.cpp
index 63c3da1ef570fb0788b7b02d9ae4e60c18d49a0c..268583ee2a17580365a2c1adf9452e6ccbe22f09 100644
--- a/Source/core/dom/SpaceSplitString.cpp
+++ b/Source/core/dom/SpaceSplitString.cpp
@@ -164,7 +164,7 @@ void SpaceSplitString::set(const AtomicString& inputString, bool shouldFoldCase)
     if (shouldFoldCase && hasNonASCIIOrUpper(string))
         string = string.foldCase();
 
-    m_data = SpaceSplitStringData::create(string);
+    m_data = SpaceSplitStringData::create(AtomicString(string));
 }
 
 SpaceSplitStringData::~SpaceSplitStringData()