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

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index e710ed2ac9c43732230606dc440af138c8e4e3f7..a9e7d2eda924cb554e2555f18e20283da04fdfc2 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -39,6 +39,12 @@ bool ContentBrowserClient::ShouldUseProcessPerSite(
   return false;
 }
 
+bool ContentBrowserClient::DoesSiteRequireDedicatedProcess(
+    BrowserContext* browser_context,
+    const GURL& effective_url) {
+  return false;
+}
+
 bool ContentBrowserClient::ShouldLockToOrigin(BrowserContext* browser_context,
                                               const GURL& effective_url) {
   return true;