Extract InstallVerifier from ExtensionSystem.

chrome/browser/extensions/test_extension_system.h

Index: chrome/browser/extensions/test_extension_system.h
diff --git a/chrome/browser/extensions/test_extension_system.h b/chrome/browser/extensions/test_extension_system.h
index 0a7022c1dbcfbadebdbfa17cce9eab5b2b90c1f0..39aa8f0267d38eb5f0fdc513253655b23f7c9cf8 100644
--- a/chrome/browser/extensions/test_extension_system.h
+++ b/chrome/browser/extensions/test_extension_system.h
@@ -25,6 +25,7 @@ class BrowserContext;
 namespace extensions {
 class DeclarativeUserScriptManager;
 class ExtensionPrefs;
+class InstallVerifier;
 class RuntimeData;
 class SharedUserScriptMaster;
 class StandardManagementPolicyProvider;
@@ -71,7 +72,6 @@ class TestExtensionSystem : public ExtensionSystem {
   LazyBackgroundTaskQueue* lazy_background_task_queue() override;
   void SetEventRouter(scoped_ptr<EventRouter> event_router);
   EventRouter* event_router() override;
-  InstallVerifier* install_verifier() override;
   QuotaService* quota_service() override;
   const OneShotEvent& ready() const override;
   ContentVerifier* content_verifier() override;
@@ -99,7 +99,6 @@ class TestExtensionSystem : public ExtensionSystem {
   scoped_refptr<InfoMap> info_map_;
   scoped_ptr<LazyBackgroundTaskQueue> lazy_background_task_queue_;
   scoped_ptr<EventRouter> event_router_;
-  scoped_ptr<InstallVerifier> install_verifier_;
   scoped_ptr<QuotaService> quota_service_;
   OneShotEvent ready_;
 };