Fix MSAN error for r373917.

third_party/WebKit/Source/core/dom/DocumentInit.cpp

Index: third_party/WebKit/Source/core/dom/DocumentInit.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentInit.cpp b/third_party/WebKit/Source/core/dom/DocumentInit.cpp
index d8e85c112159f624e6d092aee3525b04ef5765c3..389db7bfd877a1c6e0e991ab91f6a6cd8441482d 100644
--- a/third_party/WebKit/Source/core/dom/DocumentInit.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentInit.cpp
@@ -75,18 +75,7 @@ DocumentInit::DocumentInit(const KURL& url, LocalFrame* frame, WeakPtrWillBeRawP
 {
 }
 
-DocumentInit::DocumentInit(const DocumentInit& other)
-    : m_url(other.m_url)
-    , m_frame(other.m_frame)
-    , m_parent(other.m_parent)
-    , m_owner(other.m_owner)
-    , m_contextDocument(other.m_contextDocument)
-    , m_importsController(other.m_importsController)
-    , m_registrationContext(other.m_registrationContext)
-    , m_createNewRegistrationContext(other.m_createNewRegistrationContext)
-    , m_shouldReuseDefaultView(other.m_shouldReuseDefaultView)
-{
-}
+DocumentInit::DocumentInit(const DocumentInit&) = default;
 
 DocumentInit::~DocumentInit()
 {