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

Source/modules/webgl/WebGLRenderbuffer.cpp

Index: Source/modules/webgl/WebGLRenderbuffer.cpp
diff --git a/Source/modules/webgl/WebGLRenderbuffer.cpp b/Source/modules/webgl/WebGLRenderbuffer.cpp
index 941e8b781662e8aced82720659f02920d2b6e3c5..9c3531434d01a644532e4b143337eb6ca8e351ad 100644
--- a/Source/modules/webgl/WebGLRenderbuffer.cpp
+++ b/Source/modules/webgl/WebGLRenderbuffer.cpp
@@ -31,20 +31,17 @@
 
 namespace blink {
 
-PassRefPtrWillBeRawPtr<WebGLRenderbuffer> WebGLRenderbuffer::create(WebGLRenderingContextBase* ctx)
+WebGLRenderbuffer* WebGLRenderbuffer::create(WebGLRenderingContextBase* ctx)
 {
-    return adoptRefWillBeNoop(new WebGLRenderbuffer(ctx));
+    return new WebGLRenderbuffer(ctx);
 }
 
 WebGLRenderbuffer::~WebGLRenderbuffer()
 {
-#if ENABLE(OILPAN)
     // This render buffer (heap) object must finalize itself.
     m_emulatedStencilBuffer.clear();
-#endif
-    // 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.
+
+    // Call detach here to ensure that platform object deletion happens.
     //
     // See comment in WebGLBuffer's destructor for additional
     // information on why this is done for WebGLSharedObject-derived