Separate validation failures from other failures in ExecuteCodeFunction.

chrome/browser/extensions/api/tabs/tabs_api.h

Index: chrome/browser/extensions/api/tabs/tabs_api.h
diff --git a/chrome/browser/extensions/api/tabs/tabs_api.h b/chrome/browser/extensions/api/tabs/tabs_api.h
index 82b5d1b253be1d35a0b3bc678453519a9a044ab8..c8e4071ec5a3515c844b7392fab2edacfdf10f80 100644
--- a/chrome/browser/extensions/api/tabs/tabs_api.h
+++ b/chrome/browser/extensions/api/tabs/tabs_api.h
@@ -234,9 +234,8 @@ class ExecuteCodeInTabFunction : public ExecuteCodeFunction {
   // ExtensionFunction:
   bool HasPermission() override;
 
-  // Initialize the |execute_tab_id_| and |details_| if they haven't already
-  // been. Returns whether initialization was successful.
-  bool Init() override;
+  // Initializes |execute_tab_id_| and |details_|.
+  InitResult Init() override;
   bool CanExecuteScriptOnPage() override;
   ScriptExecutor* GetScriptExecutor() override;
   bool IsWebView() const override;