Merge 158408 "Revert 157959 "Introduce a new reference graph to ..."

Source/bindings/scripts/code_generator_v8.pm

Index: Source/bindings/scripts/code_generator_v8.pm
===================================================================
--- Source/bindings/scripts/code_generator_v8.pm	(revision 158536)
+++ Source/bindings/scripts/code_generator_v8.pm	(working copy)
@@ -819,7 +819,7 @@
 };
 END
 
-    my $customWrap = $interface->extendedAttributes->{"CustomToV8"} || SVGTypeNeedsToHoldContextElement($interface->name);
+    my $customWrap = $interface->extendedAttributes->{"CustomToV8"};
     if ($noToV8) {
         die "Can't suppress toV8 for subclass\n" if $interface->parent;
     } elsif ($noWrap) {
@@ -4025,24 +4025,6 @@
 END
     }
 
-    # Add strong reference from TearOff to SVGElement, so that SVGElement would never get GC-ed while the TearOff is alive. We do this in V8-side to avoid circular reference on Blink side.
-    if (SVGTypeNeedsToHoldContextElement($interface->name)) {
-        # below include needed for SVGPathSegListPropertyTearOff
-        AddToImplIncludes("V8SVGPathElement.h");
-        $implementation{nameSpaceWebCore}->add(<<END);
-v8::Handle<v8::Object> wrap($nativeType* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
-{
-    ASSERT(impl);
-    ASSERT(!DOMDataStore::containsWrapper<${v8ClassName}>(impl, isolate));
-    v8::Handle<v8::Object> wrapper = ${v8ClassName}::createWrapper(impl, creationContext, isolate);
-    if (impl->contextElement())
-        V8HiddenPropertyName::setNamedHiddenReference(wrapper, "contextElement", toV8(impl->contextElement(), creationContext, isolate));
-    return wrapper;
-}
-
-END
-    }
-
     my @enabledPerContextFunctions;
     my @normalFunctions;
     my $needsDomainSafeFunctionSetter = 0;
@@ -5798,13 +5780,6 @@
     return $type =~ /^SVGAnimated/;
 }
 
-sub SVGTypeNeedsToHoldContextElement
-{
-    my $type = shift;
-
-    return IsSVGTypeNeedingTearOff($type) || IsSVGAnimatedType($type);
-}
-
 sub GetSequenceType
 {
     my $type = shift;