Allow view-source of pages fully-blocked by Blink's XSS filter.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index 38cff6b408d594efa8b93cd183bc8a836b59002f..6017408214e959aad70314bbd632150a7098a2ee 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -1142,6 +1142,14 @@ void ViewSource(Browser* browser, WebContents* contents) {
   if (!entry)
     return;
 
+  // A "data:," URL may represent blink's blocked-page URL, and blink may have
+  // saved state prior to the block. Show that page instead when present.
+  if (entry->GetURL() == GURL("data:,")) {
+    NavigationEntry* blocked = contents->GetController().GetBlockedPageEntry();
+    if (blocked)
+      entry = blocked;
+  }
+
   ViewSource(browser, contents, entry->GetURL(), entry->GetPageState());
 }