Fix app_shell shutdown crash due to BrowserContextKeyedServices

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index f6b129246f6011c42ab595d6cccefca3204a14f1..da56988a7aa9d62b745df350709cce46ce599d35 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -10,6 +10,8 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/chrome_app_sorting.h"
 #include "chrome/browser/extensions/extension_prefs.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/app_modal_dialogs/javascript_dialog_manager.h"
@@ -154,4 +156,16 @@ ChromeExtensionsBrowserClient::GetJavaScriptDialogManager() {
   return GetJavaScriptDialogManagerInstance();
 }
 
+std::vector<BrowserContextKeyedServiceFactory*>
+ChromeExtensionsBrowserClient::GetExtensionSystemDependencies() {
+  std::vector<BrowserContextKeyedServiceFactory*> dependencies;
+  dependencies.push_back(ExtensionSystemSharedFactory::GetInstance());
+  return dependencies;
+}
+
+ExtensionSystem* ChromeExtensionsBrowserClient::CreateExtensionSystem(
+    content::BrowserContext* context) {
+  return new ExtensionSystemImpl(static_cast<Profile*>(context));
+}
+
 }  // namespace extensions