Make WebGL2 objects Oilpan compatible.

Source/core/html/canvas/WebGLSync.cpp

Index: Source/core/html/canvas/WebGLSync.cpp
diff --git a/Source/core/html/canvas/WebGLSync.cpp b/Source/core/html/canvas/WebGLSync.cpp
index 6df45da40364292ef5ba00b3e37e5e1c67694fcf..8b0d95022196611d2fb35b761288d96a66bb1de2 100644
--- a/Source/core/html/canvas/WebGLSync.cpp
+++ b/Source/core/html/canvas/WebGLSync.cpp
@@ -12,7 +12,14 @@ namespace blink {
 
 WebGLSync::~WebGLSync()
 {
-    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();
 }
 
 WebGLSync::WebGLSync(WebGL2RenderingContextBase* ctx, GLenum objectType)