Cleanup from https://codereview.chromium.org/263643005/

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index bc058c06621c9104e401d21aefd2eda3e54b6dc8..1e5f5b500b87ef7de8462bd1bc6d5e252ffd91a7 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -342,14 +342,6 @@ class ExtensionService
   // Note that this may return NULL if autoupdate is not turned on.
   extensions::ExtensionUpdater* updater();
 
-  // Notify the frontend that there was an error loading an extension.
-  // This method is public because UnpackedInstaller and InstalledLoader
-  // can post to here.
-  // TODO(aa): Remove this. It doesn't do enough to be worth the dependency
-  // of these classes on ExtensionService.
-  void ReportExtensionLoadError(const base::FilePath& extension_path,
-                                const std::string& error);
-
   // ExtensionHost of background page calls this method right after its render
   // view has been created.
   void DidCreateRenderViewForBackgroundPage(extensions::ExtensionHost* host);