Block renderer-initiated main frame navigations to data URLs

third_party/WebKit/Source/core/frame/LocalFrameClient.h

Index: third_party/WebKit/Source/core/frame/LocalFrameClient.h
diff --git a/third_party/WebKit/Source/core/frame/LocalFrameClient.h b/third_party/WebKit/Source/core/frame/LocalFrameClient.h
index 04066845b3f9b5118e46d6b8dce81a3eff7b033e..eeb87596948764c7a4fccbf4290c418e1be3e26f 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrameClient.h
+++ b/third_party/WebKit/Source/core/frame/LocalFrameClient.h
@@ -234,6 +234,12 @@ class CORE_EXPORT LocalFrameClient : public FrameClient {
   virtual void didChangeScrollOffset() {}
   virtual void didUpdateCurrentHistoryItem() {}
 
+  // Called when a content-initiated, main frame navigation to a data URL is
+  // about to occur.
+  virtual bool allowContentInitiatedDataUrlNavigations(const KURL&) {
+    return false;
+  }
+
   virtual WebCookieJar* cookieJar() const = 0;
 
   virtual void didChangeName(const String&) {}