Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/V8PerContextData.cpp

Index: Source/bindings/v8/V8PerContextData.cpp
diff --git a/Source/bindings/v8/V8PerContextData.cpp b/Source/bindings/v8/V8PerContextData.cpp
index bd1f190c5b247c0efe609a2026c46e18635eb63a..059c4ad0bf5894b4636c753e14fda12d23171241 100644
--- a/Source/bindings/v8/V8PerContextData.cpp
+++ b/Source/bindings/v8/V8PerContextData.cpp
@@ -68,7 +68,7 @@ public:
 
     V8PerContextData* perContextData() const { return m_perContextData; }
     void setPerContextData(V8PerContextData* data) { m_perContextData = data; }
-    DOMWrapperWorld* world() const { return m_world.get(); }
+    DOMWrapperWorld& world() const { return *m_world; }
     v8::Handle<v8::Context> context() const { return m_context.newLocal(m_isolate); }
 
 private:
@@ -78,6 +78,7 @@ private:
         , m_perContextData(0)
         , m_world(world)
     {
+        ASSERT(m_world);
         m_context.setWeak(this, &V8PerContextDataHolder::weakCallback);
         context->SetAlignedPointerInEmbedderData(v8ContextPerContextDataIndex, this);
     }
@@ -130,10 +131,9 @@ V8PerContextData* V8PerContextData::from(v8::Handle<v8::Context> context)
     return V8PerContextDataHolder::from(context)->perContextData();
 }
 
-DOMWrapperWorld* V8PerContextData::world(v8::Handle<v8::Context> context)
+DOMWrapperWorld& V8PerContextData::world(v8::Handle<v8::Context> context)
 {
-    DOMWrapperWorld* world = V8PerContextDataHolder::from(context)->world();
-    ASSERT(world);
+    DOMWrapperWorld& world = V8PerContextDataHolder::from(context)->world();
     return world;
 }