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

Source/modules/webgl/WebGLSampler.cpp

Index: Source/modules/webgl/WebGLSampler.cpp
diff --git a/Source/modules/webgl/WebGLSampler.cpp b/Source/modules/webgl/WebGLSampler.cpp
index 4aefbd7a61ad05f6b982610731dc9d0e2c458323..338c672281350c73b91f8bae6e3594cf2e0d2691 100644
--- a/Source/modules/webgl/WebGLSampler.cpp
+++ b/Source/modules/webgl/WebGLSampler.cpp
@@ -10,14 +10,20 @@
 
 namespace blink {
 
-WebGLSampler* WebGLSampler::create(WebGL2RenderingContextBase* ctx)
+PassRefPtrWillBeRawPtr<WebGLSampler> WebGLSampler::create(WebGL2RenderingContextBase* ctx)
 {
-    return new WebGLSampler(ctx);
+    return adoptRefWillBeNoop(new WebGLSampler(ctx));
 }
 
 WebGLSampler::~WebGLSampler()
 {
-    // See the comment in WebGLObject::detachAndDeleteObject().
+    // 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();
 }