InlinedVisitor: Migrate html to use inlined tracing

Source/core/html/canvas/WebGL2RenderingContext.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/html/canvas/WebGL2RenderingContext.h"
 
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/canvas/ContextAttributeHelpers.h"
@@ skipping 49 matching lines @@
 
 }
 
 void WebGL2RenderingContext::registerContextExtensions()
 {
     // Register privileged extensions.
     registerExtension<WebGLDebugRendererInfo>(m_webglDebugRendererInfo);
     registerExtension<WebGLDebugShaders>(m_webglDebugShaders);
 }
 
-void WebGL2RenderingContext::trace(Visitor* visitor)
+DEFINE_TRACE(WebGL2RenderingContext)
 {
     visitor->trace(m_webglDebugRendererInfo);
     visitor->trace(m_webglDebugShaders);
     WebGL2RenderingContextBase::trace(visitor);
 }
 
 } // namespace blink