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

Source/modules/webgl/WebGLBuffer.cpp

Index: Source/modules/webgl/WebGLBuffer.cpp
diff --git a/Source/modules/webgl/WebGLBuffer.cpp b/Source/modules/webgl/WebGLBuffer.cpp
index 0969b7b8983abc6cf31e5d5cec766228e1b141b4..4744cd162f998f72a157dd00be8a6df6b074cbf1 100644
--- a/Source/modules/webgl/WebGLBuffer.cpp
+++ b/Source/modules/webgl/WebGLBuffer.cpp
@@ -31,9 +31,9 @@
 
 namespace blink {
 
-WebGLBuffer* WebGLBuffer::create(WebGLRenderingContextBase* ctx)
+PassRefPtrWillBeRawPtr<WebGLBuffer> WebGLBuffer::create(WebGLRenderingContextBase* ctx)
 {
-    return new WebGLBuffer(ctx);
+    return adoptRefWillBeNoop(new WebGLBuffer(ctx));
 }
 
 WebGLBuffer::WebGLBuffer(WebGLRenderingContextBase* ctx)
@@ -45,7 +45,15 @@
 
 WebGLBuffer::~WebGLBuffer()
 {
-    // See the comment in WebGLObject::detachAndDeleteObject().
+    // Delete the buffer's platform object. This object will have been
+    // detached from the WebGLContextGroup if the group object was
+    // finalized first. With Oilpan not enabled, it always will be,
+    // but with Oilpan enabled, the WebGLBuffer might end up being
+    // finalized first. In which case detachment is needed to ensure
+    // that the platform object is indeed deleted.
+    //
+    // To keep the code regular, the trivial detach()ment is always
+    // performed.
     detachAndDeleteObject();
 }