Implement new strategy for default apps

chrome/browser/extensions/crx_installer.cc

Index: chrome/browser/extensions/crx_installer.cc
diff --git a/chrome/browser/extensions/crx_installer.cc b/chrome/browser/extensions/crx_installer.cc
index 40d8cd2650b01da91a08fe7bc121e948f3408825..12f988ed7c8adfdfb97af49c3bc66c5d15df33e5 100644
--- a/chrome/browser/extensions/crx_installer.cc
+++ b/chrome/browser/extensions/crx_installer.cc
@@ -190,7 +190,7 @@ bool CrxInstaller::AllowInstall(Extension* extension, std::string* error) {
     // For self-hosted apps, verify that the entire extent is on the same
     // host (or a subdomain of the host) the download happened from.  There's
     // no way for us to verify that the app controls any other hosts.
-    if (!is_gallery_install_) {
+    if (!is_gallery_install_ && client_) {
       URLPattern pattern(UserScript::kValidUserScriptSchemes);
       pattern.set_host(original_url_.host());
       pattern.set_match_subdomains(true);