[Extensions UI] Fix a crash when clicking on a bubble's learn more

chrome/browser/ui/extensions/extension_message_bubble_browsertest.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_BROWSERTEST_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_BROWSERTEST_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 34 matching lines @@
 
   // Checks that there is no active bubble for the given |browser|.
   // We specify whether or not the toolbar model should be highlighting or there
   // is a bubble active since another browser window may have an active bubble.
   void CheckBubbleIsNotPresent(Browser* browser,
                                bool should_profile_have_bubble,
                                bool should_be_highlighting);
   // Performs the platform-specific checks.
   virtual void CheckBubbleIsNotPresentNative(Browser* browser) = 0;
 
+  // Clicks on the corresponding button in the bubble.
+  virtual void ClickLearnMoreButton(Browser* browser) = 0;
+  virtual void ClickActionButton(Browser* browser) = 0;
+  virtual void ClickDismissButton(Browser* browser) = 0;
+
   // Adds a new extension that uses the chrome_settings_overrides api to
   // override a setting specified in |settings_override_value|.
   void AddSettingsOverrideExtension(const std::string& settings_override_value);
 
   // The following are essentially the different tests, but we can't define the
   // tests in this file, since it relies on platform-specific implementation
   // (the above virtual methods).
 
   // Tests that an extension bubble will be anchored to an extension action when
   // there are extensions with actions.
@@ skipping 33 matching lines @@
   void TestControlledHomeBubbleShown();
 
   // Tests that the bubble indicating an extension is controlling a user's
   // search engine is shown.
   void TestControlledSearchBubbleShown();
 
   // Tests that having multiple windows, all of which could be vying to show a
   // warning bubble, behaves properly.
   void TestBubbleWithMultipleWindows();
 
+  // Tests clicking on the corresponding button in the bubble view. The logic
+  // for these is tested more thoroughly in the unit tests, but this ensures
+  // that nothing goes wrong end-to-end.
+  void TestClickingLearnMoreButton();
+  void TestClickingActionButton();
+  void TestClickingDismissButton();
+
  private:
   std::unique_ptr<extensions::FeatureSwitch::ScopedOverride>
       dev_mode_bubble_override_;
 
   // The backing directory for a custom extension loaded during a test. Null if
   // no custom extension is loaded.
   std::unique_ptr<extensions::TestExtensionDir> custom_extension_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionMessageBubbleBrowserTest);
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_MESSAGE_BUBBLE_BROWSERTEST_H_