Block renderer-initiated main frame navigations to data URLs

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 64cb69786f7f98f45f6d774868a1d73920f8b7c5..cacb84ed88a4b3bc87aaca1d40d306da943bc62d 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -326,6 +326,12 @@ class BLINK_EXPORT WebFrameClient {
     return WebHistoryItem();
   }
 
+  // Asks the embedder whether the frame is allowed to navigate the main frame
+  // to a data URL.
+  virtual bool AllowContentInitiatedDataUrlNavigations(const WebURL&) {
+    return false;
+  }
+
   // Navigational notifications ------------------------------------------
 
   // These notifications bracket any loading that occurs in the WebFrame.