Move URL fixup to a preliminary phase that doesn't affect virtual URLs.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index a0ad854e231c6296469b8ee2a44639cf5c3b6ea8..135e9db519dd3336585c110c154ade76e14a7b2e 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -104,6 +104,7 @@
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "components/translate/core/common/translate_switches.h"
+#include "components/url_fixer/url_fixer.h"
 #include "content/public/browser/browser_child_process_host.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/browser/browser_ppapi_host.h"
@@ -2261,7 +2262,8 @@ void ChromeContentBrowserClient::BrowserURLHandlerCreated(
 
   // about: handler. Must come before chrome: handler, since it will
   // rewrite about: urls to chrome: URLs and then expect chrome: to
-  // actually handle them.
+  // actually handle them.  Also relies on a preliminary fixup phase.
+  handler->SetFixupHandler(&FixupBrowserAboutURL);
   handler->AddHandlerPair(&WillHandleBrowserAboutURL,
                           BrowserURLHandler::null_handler());