Exempt about: URLs from self-reference check for nested frames

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 455246e40e18ec3bbc57456cb5c97b84a929fba1..d8ee90b46b59e6e735ddba158c43d7042137db26 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -756,6 +756,10 @@ EphemeralRange LocalFrame::rangeForPoint(const IntPoint& framePoint)
 
 bool LocalFrame::isURLAllowed(const KURL& url) const
 {
+    // Exempt about: URLs from self-reference check.
+    if (url.protocolIsAbout())
+        return true;
+
     // We allow one level of self-reference because some sites depend on that,
     // but we don't allow more than one.
     bool foundSelfReference = false;