Convert //extensions/{common,shell} from scoped_ptr to std::unique_ptr

extensions/test/test_extensions_client.h

Index: extensions/test/test_extensions_client.h
diff --git a/extensions/test/test_extensions_client.h b/extensions/test/test_extensions_client.h
index cce385466de639ae7cbce5bfa622de528c876d0c..e12f0a9ef57e8dbd6029d8c59ef0fb3f35479765 100644
--- a/extensions/test/test_extensions_client.h
+++ b/extensions/test/test_extensions_client.h
@@ -31,9 +31,9 @@ class TestExtensionsClient : public ExtensionsClient {
   const PermissionMessageProvider& GetPermissionMessageProvider()
       const override;
   const std::string GetProductName() override;
-  scoped_ptr<FeatureProvider> CreateFeatureProvider(
+  std::unique_ptr<FeatureProvider> CreateFeatureProvider(
       const std::string& name) const override;
-  scoped_ptr<JSONFeatureProviderSource> CreateFeatureProviderSource(
+  std::unique_ptr<JSONFeatureProviderSource> CreateFeatureProviderSource(
       const std::string& name) const override;
   void FilterHostPermissions(const URLPatternSet& hosts,
                              URLPatternSet* new_hosts,