Extract DeclarativeUserScriptManager 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..4c2626f38d2f658c1fef34a5a6d2ac81815ffb98 100644
--- a/chrome/browser/extensions/test_extension_system.h
+++ b/chrome/browser/extensions/test_extension_system.h
@@ -23,7 +23,6 @@ class BrowserContext;
 }
 
 namespace extensions {
-class DeclarativeUserScriptManager;
 class ExtensionPrefs;
 class RuntimeData;
 class SharedUserScriptMaster;
@@ -63,7 +62,6 @@ class TestExtensionSystem : public ExtensionSystem {
   RuntimeData* runtime_data() override;
   ManagementPolicy* management_policy() override;
   SharedUserScriptMaster* shared_user_script_master() override;
-  DeclarativeUserScriptManager* declarative_user_script_manager() override;
   StateStore* state_store() override;
   StateStore* rules_store() override;
   TestingValueStore* value_store() { return value_store_; }
@@ -92,7 +90,6 @@ class TestExtensionSystem : public ExtensionSystem {
   scoped_ptr<StateStore> state_store_;
   // A pointer to the TestingValueStore owned by |state_store_|.
   TestingValueStore* value_store_;
-  scoped_ptr<DeclarativeUserScriptManager> declarative_user_script_manager_;
   scoped_ptr<ManagementPolicy> management_policy_;
   scoped_ptr<RuntimeData> runtime_data_;
   scoped_ptr<ExtensionService> extension_service_;