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

Source/modules/webgl/WebGLSync.cpp

Index: Source/modules/webgl/WebGLSync.cpp
diff --git a/Source/modules/webgl/WebGLSync.cpp b/Source/modules/webgl/WebGLSync.cpp
index d98c2f5d2e22a4a1df3f6fb10f4fb21cffe56f6c..5d7dc9bb8e2e2379a3258b3d8887e5828c0df037 100644
--- a/Source/modules/webgl/WebGLSync.cpp
+++ b/Source/modules/webgl/WebGLSync.cpp
@@ -12,13 +12,7 @@ namespace blink {
 
 WebGLSync::~WebGLSync()
 {
-    // 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.
+    // See the comment in WebGLObject::detachAndDeleteObject().
     detachAndDeleteObject();
 }