Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/bindings/v8/ScriptProfiler.cpp

Index: Source/bindings/v8/ScriptProfiler.cpp
diff --git a/Source/bindings/v8/ScriptProfiler.cpp b/Source/bindings/v8/ScriptProfiler.cpp
index 85bb1071851456f95f3e5df26ad27809aad80555..b10c8255a4ce8040a692c939322c72083c14f562 100644
--- a/Source/bindings/v8/ScriptProfiler.cpp
+++ b/Source/bindings/v8/ScriptProfiler.cpp
@@ -77,11 +77,11 @@ PassRefPtr<ScriptProfile> ScriptProfiler::stop(const String& title)
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
     if (!profiler)
-        return 0;
+        return nullptr;
     v8::HandleScope handleScope(isolate);
     const v8::CpuProfile* profile = profiler->StopCpuProfiling(v8String(isolate, title));
     if (!profile)
-        return 0;
+        return nullptr;
 
     String profileTitle = toCoreString(profile->GetTitle());
     double idleTime = 0.0;
@@ -233,13 +233,13 @@ PassRefPtr<ScriptHeapSnapshot> ScriptProfiler::takeHeapSnapshot(const String& ti
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::HeapProfiler* profiler = isolate->GetHeapProfiler();
     if (!profiler)
-        return 0;
+        return nullptr;
     v8::HandleScope handleScope(isolate);
     ASSERT(control);
     ActivityControlAdapter adapter(control);
     GlobalObjectNameResolver resolver;
     const v8::HeapSnapshot* snapshot = profiler->TakeHeapSnapshot(v8String(isolate, title), &adapter, &resolver);
-    return snapshot ? ScriptHeapSnapshot::create(snapshot) : 0;
+    return snapshot ? ScriptHeapSnapshot::create(snapshot) : nullptr;
 }
 
 static v8::RetainedObjectInfo* retainedDOMInfo(uint16_t classId, v8::Handle<v8::Value> wrapper)