don't display platform app resources in normal browser windows

chrome/common/url_constants.cc

Index: chrome/common/url_constants.cc
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index 15cd571e16d58644c1bff255fd6d312f5adc99b9..c45023e252657e7fdf0d8f69c4cb299290b59121 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -295,6 +295,10 @@ const char kBluetoothAddDeviceSubPage[] = "bluetooth";
 // Extension sub pages.
 const char kExtensionConfigureCommandsSubPage[] = "configureCommands";
 
+const char kExtensionInvalidRequestURL[] = "chrome-extension://invalid/";
+const char kExtensionResourceInvalidRequestURL[] =
+    "chrome-extension-resource://invalid/";
+
 const char kSyncGoogleDashboardURL[] =
     "https://www.google.com/settings/chrome/sync/";