Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/css/MediaQueryEvaluator.cpp

Index: Source/core/css/MediaQueryEvaluator.cpp
diff --git a/Source/core/css/MediaQueryEvaluator.cpp b/Source/core/css/MediaQueryEvaluator.cpp
index 36fc282c248fb14d8a7c25cd88645e0de087a9b0..a7d324494268ad8f4f7d699d261cf47e5d630182 100644
--- a/Source/core/css/MediaQueryEvaluator.cpp
+++ b/Source/core/css/MediaQueryEvaluator.cpp
@@ -64,7 +64,7 @@ static FunctionMap* gFunctionMap;
 
 MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
     : m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }
@@ -72,7 +72,7 @@ MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
 MediaQueryEvaluator::MediaQueryEvaluator(const AtomicString& acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }
@@ -80,7 +80,7 @@ MediaQueryEvaluator::MediaQueryEvaluator(const AtomicString& acceptedMediaType,
 MediaQueryEvaluator::MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }