Make WebGL2 objects Oilpan compatible.

Source/core/html/canvas/WebGLTransformFeedback.cpp

Index: Source/core/html/canvas/WebGLTransformFeedback.cpp
diff --git a/Source/core/html/canvas/WebGLTransformFeedback.cpp b/Source/core/html/canvas/WebGLTransformFeedback.cpp
index 634958b2cc23b81397859a22b68a45411b2fc860..0f1ecc9929754fe47d925f1a252732b53541611f 100644
--- a/Source/core/html/canvas/WebGLTransformFeedback.cpp
+++ b/Source/core/html/canvas/WebGLTransformFeedback.cpp
@@ -17,7 +17,14 @@ PassRefPtrWillBeRawPtr<WebGLTransformFeedback> WebGLTransformFeedback::create(We
 
 WebGLTransformFeedback::~WebGLTransformFeedback()
 {
-    deleteObject(0);
+    // Always call detach here to ensure that platform object deletion
+    // happens with Oilpan enabled. It keeps the code regular to do it
+    // with or without Oilpan enabled.
+    //
+    // See comment in WebGLBuffer's destructor for additional
+    // information on why this is done for WebGLSharedObject-derived
+    // objects.
+    detachAndDeleteObject();
 }
 
 WebGLTransformFeedback::WebGLTransformFeedback(WebGL2RenderingContextBase* ctx)