Implicit prefinalizer registration.

third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md

Index: third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md
diff --git a/third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md b/third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md
index e9815c3df46a9f0a835b1cbb33695668e251b8d5..8a7abc56a84ccd036835109a2e530d043d572ef2 100644
--- a/third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md
+++ b/third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md
@@ -178,17 +178,10 @@ with a destructor.
 
 A pre-finalizer must have the following function signature: `void preFinalizer()`. You can change the function name.
 
-A pre-finalizer must be registered in the constructor by using the following statement:
-"`ThreadState::current()->registerPreFinalizer(this);`".
-
 ```c++
 class YourClass : public GarbageCollectedFinalized<YourClass> {
     USING_PRE_FINALIZER(YourClass, dispose);
 public:
-    YourClass()
-    {
-        ThreadState::current()->registerPreFinalizer(this);
-    }
     void dispose()
     {
         m_other->dispose(); // OK; you can touch other on-heap objects in a pre-finalizer.