Use C++11 features in core/html

Source/core/html/canvas/WebGLSharedObject.cpp

Index: Source/core/html/canvas/WebGLSharedObject.cpp
diff --git a/Source/core/html/canvas/WebGLSharedObject.cpp b/Source/core/html/canvas/WebGLSharedObject.cpp
index 8bc19749efb87dee34e6852c6db5a6567e826007..100f28d361918db1d095069200be1c417fd690de 100644
--- a/Source/core/html/canvas/WebGLSharedObject.cpp
+++ b/Source/core/html/canvas/WebGLSharedObject.cpp
@@ -48,7 +48,7 @@ void WebGLSharedObject::detachContextGroup()
 {
     detach();
     if (m_contextGroup) {
-        deleteObject(0);
+        deleteObject(nullptr);
         m_contextGroup->removeObject(this);
         m_contextGroup = nullptr;
     }
@@ -56,7 +56,7 @@ void WebGLSharedObject::detachContextGroup()
 
 blink::WebGraphicsContext3D* WebGLSharedObject::getAWebGraphicsContext3D() const
 {
-    return m_contextGroup ? m_contextGroup->getAWebGraphicsContext3D() : 0;
+    return m_contextGroup ? m_contextGroup->getAWebGraphicsContext3D() : nullptr;
 }
 
 }