Revert of [Oilpan] Migrate classes under module/webgl onto oilpan heap

Source/modules/webgl/WebGLContextObject.cpp

Index: Source/modules/webgl/WebGLContextObject.cpp
diff --git a/Source/modules/webgl/WebGLContextObject.cpp b/Source/modules/webgl/WebGLContextObject.cpp
index 4278843a94a0f412d5edbc8de1483e29b1662bf7..e1359f0c1220bbfb37173d2e8137b9f63319e520 100644
--- a/Source/modules/webgl/WebGLContextObject.cpp
+++ b/Source/modules/webgl/WebGLContextObject.cpp
@@ -39,6 +39,10 @@
 
 WebGLContextObject::~WebGLContextObject()
 {
+#if !ENABLE(OILPAN)
+    if (m_context)
+        m_context->removeContextObject(this);
+#endif
 }
 
 void WebGLContextObject::detachContext()
@@ -53,7 +57,7 @@
 
 WebGraphicsContext3D* WebGLContextObject::getAWebGraphicsContext3D() const
 {
-    return m_context ? m_context->webContext() : nullptr;
+    return m_context ? m_context->webContext() : 0;
 }
 
 DEFINE_TRACE(WebGLContextObject)