Apply OwnPtr|PassOwnPtr to m_validationMessageClient and setValidationMessageClient() in Page class

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 2e5e796b6661843b473c0b4490c1469c785df6ae..466074bf1c7f97f5711032272d5d70bd64e7386c 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -121,7 +121,6 @@ Page::Page(PageClients& pageClients)
     , m_undoStack(UndoStack::create())
     , m_backForwardClient(pageClients.backForwardClient)
     , m_editorClient(pageClients.editorClient)
-    , m_validationMessageClient(0)
     , m_spellCheckerClient(pageClients.spellCheckerClient)
     , m_storageClient(pageClients.storageClient)
     , m_subframeCount(0)
@@ -320,6 +319,11 @@ void Page::unmarkAllTextMatches()
     } while (frame);
 }
 
+void Page::setValidationMessageClient(PassOwnPtr<ValidationMessageClient> client)
+{
+    m_validationMessageClient = client;
+}
+
 void Page::setDefersLoading(bool defers)
 {
     if (defers == m_defersLoading)