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

Source/modules/webgl/WebGLShader.cpp

Index: Source/modules/webgl/WebGLShader.cpp
diff --git a/Source/modules/webgl/WebGLShader.cpp b/Source/modules/webgl/WebGLShader.cpp
index 6b99d306410d4aacc7bb0e3507e3d33a110cc3cd..45602bc7b3ab030cfc35aa2ae2379765977ad701 100644
--- a/Source/modules/webgl/WebGLShader.cpp
+++ b/Source/modules/webgl/WebGLShader.cpp
@@ -31,9 +31,9 @@
 
 namespace blink {
 
-WebGLShader* WebGLShader::create(WebGLRenderingContextBase* ctx, GLenum type)
+PassRefPtrWillBeRawPtr<WebGLShader> WebGLShader::create(WebGLRenderingContextBase* ctx, GLenum type)
 {
-    return new WebGLShader(ctx, type);
+    return adoptRefWillBeNoop(new WebGLShader(ctx, type));
 }
 
 WebGLShader::WebGLShader(WebGLRenderingContextBase* ctx, GLenum type)
@@ -46,7 +46,13 @@
 
 WebGLShader::~WebGLShader()
 {
-    // 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();
 }