Move ExtensionWarningService and ExtensionsWarningSet to extensions.

extensions/test/test_extensions_client.cc

Index: extensions/test/test_extensions_client.cc
diff --git a/extensions/test/test_extensions_client.cc b/extensions/test/test_extensions_client.cc
index fc0391a57a6e119a010e852a1b8eb388bf663e32..a47e60eeda44285787cdcfb6c21a1b8267f4ca92 100644
--- a/extensions/test/test_extensions_client.cc
+++ b/extensions/test/test_extensions_client.cc
@@ -55,6 +55,10 @@ TestExtensionsClient::GetPermissionMessageProvider() const {
   return provider;
 }
 
+const std::string TestExtensionsClient::GetProductName() {
+  return "extensions_test";
+}
+
 scoped_ptr<FeatureProvider> TestExtensionsClient::CreateFeatureProvider(
     const std::string& name) const {
   scoped_ptr<FeatureProvider> provider;