[Extensions] Remove ExtensionFunction::SetError()

chrome/browser/extensions/chrome_extension_function.h

Index: chrome/browser/extensions/chrome_extension_function.h
diff --git a/chrome/browser/extensions/chrome_extension_function.h b/chrome/browser/extensions/chrome_extension_function.h
index 59d5e1e0ad19324de4bbbe795683da57d1149514..d16b95663980365956ee3639d8c86f84d4bc92cc 100644
--- a/chrome/browser/extensions/chrome_extension_function.h
+++ b/chrome/browser/extensions/chrome_extension_function.h
@@ -54,9 +54,10 @@ class ChromeUIThreadExtensionFunction : public UIThreadExtensionFunction {
   // Same as above but uses WindowControllerList instead of BrowserList.
   extensions::WindowController* GetExtensionWindowController();
 
+  void SetError(const std::string& error);
+
   // ExtensionFunction:
   content::WebContents* GetAssociatedWebContents() override;
-  void SetError(const std::string& error) override;
   const std::string& GetError() const override;
 
  protected: