Don't use browser windows for platform app shell windows

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index 2db94728a0ec34c931248d3b36f00dbc7a905738..99f975387f4963971b77a7cb7b46a286a70452a3 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -116,6 +116,19 @@ ExtensionProcessManager::~ExtensionProcessManager() {
   DCHECK(background_hosts_.empty());
 }
 
+ExtensionHost* ExtensionProcessManager::CreateShellHost(
+    const Extension* extension,
+    const GURL& url) {
+  DCHECK(extension);
+  ExtensionHost* host = new ExtensionHost(extension,
+                                          GetSiteInstanceForURL(url),
+                                          url,
+                                          chrome::VIEW_TYPE_APP_SHELL);
+  host->CreateViewWithoutBrowser();
+  OnExtensionHostCreated(host, false /* not a background host */);
+  return host;
+}
+
 ExtensionHost* ExtensionProcessManager::CreateViewHost(
     const Extension* extension,
     const GURL& url,