Move ExtensionWarningService and ExtensionsWarningSet to extensions.

extensions/common/extensions_client.h

Index: extensions/common/extensions_client.h
diff --git a/extensions/common/extensions_client.h b/extensions/common/extensions_client.h
index 9f4ebf92a9e847262c50d598a6d5f8396e111618..623a2de9e60f7ef3020666f4679a17d02853a29c 100644
--- a/extensions/common/extensions_client.h
+++ b/extensions/common/extensions_client.h
@@ -45,6 +45,9 @@ class ExtensionsClient {
   virtual const PermissionMessageProvider& GetPermissionMessageProvider()
       const = 0;
 
+  // Returns the application name. For example, "Chromium" or "app_shell".
+  virtual const std::string GetProductName() = 0;
+
   // Create a FeatureProvider for a specific feature type, e.g. "permission".
   virtual scoped_ptr<FeatureProvider> CreateFeatureProvider(
       const std::string& name) const = 0;