Allow Vector<Optional> and Optional::get()

third_party/WebKit/Source/wtf/Optional.h

Index: third_party/WebKit/Source/wtf/Optional.h
diff --git a/third_party/WebKit/Source/wtf/Optional.h b/third_party/WebKit/Source/wtf/Optional.h
index 1c2e422f522d6cb210e65f7ed6f71cf3597c6be4..a28bd804308c3e218f80c575ac77cabae5448102 100644
--- a/third_party/WebKit/Source/wtf/Optional.h
+++ b/third_party/WebKit/Source/wtf/Optional.h
@@ -28,12 +28,14 @@ namespace WTF {
 //       recorder.emplace(constructor, args, here);
 //   // recorder destroyed at end of scope
 //
+// It can be used in WTF::Vector.
+//
 // Note in particular that unlike a pointer, though, dereferencing a const
 // optional yields a const reference.
 
 template <typename T>
 class Optional final {
-    DISALLOW_NEW();
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     WTF_MAKE_NONCOPYABLE(Optional);
 public:
     Optional() : m_ptr(nullptr) { }
@@ -50,6 +52,8 @@ public:
     const T& operator*() const { ASSERT_WITH_SECURITY_IMPLICATION(m_ptr); return *m_ptr; }
     T* operator->() { ASSERT_WITH_SECURITY_IMPLICATION(m_ptr); return m_ptr; }
     const T* operator->() const { ASSERT_WITH_SECURITY_IMPLICATION(m_ptr); return m_ptr; }
+    T* get() { return m_ptr; }
+    const T* get() const { return m_ptr; }
 
     template <typename... Args>
     void emplace(Args&&... args)