Revert of Accept invalid chrome-extension:// and chrome:// CSP tokens

extensions/common/csp_validator.cc

Index: extensions/common/csp_validator.cc
diff --git a/extensions/common/csp_validator.cc b/extensions/common/csp_validator.cc
index 622136757b255176a761f9a9275ec85cd86ba2b5..65edd0a3aaffb578226972e59369a15c6b7fc8e0 100644
--- a/extensions/common/csp_validator.cc
+++ b/extensions/common/csp_validator.cc
@@ -53,11 +53,6 @@
   size_t end_of_host = url.find("/", start_of_host);
   if (end_of_host == std::string::npos)
     end_of_host = url.size();
-
-  // A missing host such as "chrome-extension://" is invalid, but for backwards-
-  // compatibility, accept such CSP parts. They will be ignored by Blink anyway.
-  if (start_of_host == end_of_host)
-    return true;
 
   // Note: It is sufficient to only compare the first character against '*'
   // because the CSP only allows wildcards at the start of a directive, see