Make SecurityContext available in RemoteFrames.

Source/core/frame/RemoteFrame.cpp

Index: Source/core/frame/RemoteFrame.cpp
diff --git a/Source/core/frame/RemoteFrame.cpp b/Source/core/frame/RemoteFrame.cpp
index 1b0e04e5b191d34055b23181db1a5b72f3ec9ea7..1e5113d7d258276b06c16ccee30e7f4c5152d9f1 100644
--- a/Source/core/frame/RemoteFrame.cpp
+++ b/Source/core/frame/RemoteFrame.cpp
@@ -5,6 +5,7 @@
 #include "config.h"
 #include "core/frame/RemoteFrame.h"
 
+#include "core/dom/RemoteSecurityContext.h"
 #include "core/frame/RemoteFrameClient.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ -14,6 +15,7 @@ namespace blink {
 
 inline RemoteFrame::RemoteFrame(RemoteFrameClient* client, FrameHost* host, FrameOwner* owner)
     : Frame(client, host, owner)
+    , m_securityContext(RemoteSecurityContext::create())
 {
 }
 
@@ -50,6 +52,11 @@ void RemoteFrame::detach()
     Frame::detach();
 }
 
+RemoteSecurityContext* RemoteFrame::securityContext() const
+{
+    return m_securityContext.get();
+}
+
 void RemoteFrame::forwardInputEvent(Event* event)
 {
     remoteFrameClient()->forwardInputEvent(event);