Don't do Instant previews of chrome://crash

chrome/common/url_constants.h

Index: chrome/common/url_constants.h
diff --git a/chrome/common/url_constants.h b/chrome/common/url_constants.h
index 19d2034a535675ce07486a35b7921d60654b36f8..1e0df4a9f504f9d8bde30889242707d3b4fba317 100644
--- a/chrome/common/url_constants.h
+++ b/chrome/common/url_constants.h
@@ -37,7 +37,9 @@ extern const char kChromeUIExtensionsURL[];
 extern const char kChromeUIFlagsURL[];
 extern const char kChromeUIFlashURL[];
 extern const char kChromeUIFaviconURL[];
+extern const char kChromeUIGpuCleanURL[];
 extern const char kChromeUIGpuCrashURL[];
+extern const char kChromeUIGpuHangURL[];
 extern const char kChromeUIHangURL[];
 extern const char kChromeUIHistory2URL[];
 extern const char kChromeUIHistoryURL[];
@@ -257,6 +259,10 @@ extern const char kSpeechInputAboutURL[];
 // The URL for the "Learn more" page for register protocol handler infobars.
 extern const char kLearnMoreRegisterProtocolHandlerURL[];
 
+// "Debug" pages which are dangerous and not for general consumption.
+extern const char* const kChromeDebugURLs[];
+extern int kNumberOfChromeDebugURLs;
+
 // Call near the beginning of startup to register Chrome's internal URLs that
 // should be parsed as "standard" with the googleurl library.
 void RegisterChromeSchemes();