Modify --isolate-extensions to not isolate hosted apps.

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index e5ebb2e09318b232d7ce52fda12b5880ab7bb21a..03c0217475e9027c24590e55301422c3ac6de373 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -617,9 +617,7 @@ void ChromeContentClient::AddServiceWorkerSchemes(
   schemes->insert(extensions::kExtensionScheme);
 }
 
-void ChromeContentClient::AddIsolatedSchemes(std::set<std::string>* schemes) {
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kIsolateExtensions)) {
-    schemes->insert(extensions::kExtensionScheme);
-  }
+bool ChromeContentClient::IsSupplementarySiteIsolationModeEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kIsolateExtensions);
 }