Settings Overides -- warn user when extensions override their NTP.

chrome/browser/extensions/ntp_overridden_bubble_controller.h

Index: chrome/browser/extensions/ntp_overridden_bubble_controller.h
diff --git a/chrome/browser/extensions/ntp_overridden_bubble_controller.h b/chrome/browser/extensions/ntp_overridden_bubble_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..0d49ea97e554b3e7c2d62a24c0db68a3ff33d4be
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+++ b/chrome/browser/extensions/ntp_overridden_bubble_controller.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2014 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_EXTENSIONS_NTP_OVERRIDDEN_BUBBLE_CONTROLLER_H_
+#define CHROME_BROWSER_EXTENSIONS_NTP_OVERRIDDEN_BUBBLE_CONTROLLER_H_
+
+#include <string>
+#include "chrome/browser/extensions/extension_message_bubble_controller.h"
+
+class ExtensionService;
+
+namespace extensions {
+
+class NtpOverriddenBubbleController : public ExtensionMessageBubbleController {
+ public:
+  explicit NtpOverriddenBubbleController(Profile* profile);
+  virtual ~NtpOverriddenBubbleController();
+
+  // Whether the controller knows that we should show the bubble for extension
+  // with |extension_id|. Returns true if so.
+  bool ShouldShow(const std::string& extension_id);
+
+  // ExtensionMessageBubbleController:
+  virtual bool CloseOnDeactivate() OVERRIDE;
+
+ private:
+  // A weak pointer to the profile we are associated with. Not owned by us.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(NtpOverriddenBubbleController);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_NTP_OVERRIDDEN_BUBBLE_CONTROLLER_H_