Fix template angle bracket syntax in dom

Source/core/dom/MutationObserver.cpp

Index: Source/core/dom/MutationObserver.cpp
diff --git a/Source/core/dom/MutationObserver.cpp b/Source/core/dom/MutationObserver.cpp
index 5f5b1c96366be3b62f8479d1172e06be393b4a32..46905e3e15366b3b0507b493c7c416f052d30ba2 100644
--- a/Source/core/dom/MutationObserver.cpp
+++ b/Source/core/dom/MutationObserver.cpp
@@ -207,9 +207,9 @@ void MutationObserver::setHasTransientRegistration()
     activateObserver(this);
 }
 
-WillBeHeapHashSet<RawPtrWillBeMember<Node> > MutationObserver::getObservedNodes() const
+WillBeHeapHashSet<RawPtrWillBeMember<Node>> MutationObserver::getObservedNodes() const
 {
-    WillBeHeapHashSet<RawPtrWillBeMember<Node> > observedNodes;
+    WillBeHeapHashSet<RawPtrWillBeMember<Node>> observedNodes;
     for (const auto& registration : m_registrations)
         registration->addRegistrationNodesToSet(observedNodes);
     return observedNodes;