Update device permissions dialog ui for Chrome apps and extensions

extensions/browser/api/device_permissions_prompt.h

 // Copyright 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 EXTENSIONS_BROWSER_DEVICE_PERMISSIONS_PROMPT_H_
 #define EXTENSIONS_BROWSER_DEVICE_PERMISSIONS_PROMPT_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 50 matching lines @@
       base::string16 serial_number_;
 
      private:
       bool granted_ = false;
     };
 
     // Since the set of devices can change while the UI is visible an
     // implementation should register an observer.
     class Observer {
      public:
-      virtual void OnDevicesChanged() = 0;
+      virtual void OnDeviceAdded(size_t index) = 0;
+      virtual void OnDeviceRemoved(size_t index) = 0;
 
      protected:
       virtual ~Observer();
     };
 
     Prompt(const Extension* extension,
            content::BrowserContext* context,
            bool multiple);
 
     // Only one observer may be registered at a time.
     virtual void SetObserver(Observer* observer);
 
-    virtual base::string16 GetHeading() const = 0;
-    base::string16 GetPromptMessage() const;
     size_t GetDeviceCount() const { return devices_.size(); }
     base::string16 GetDeviceName(size_t index) const;
     base::string16 GetDeviceSerialNumber(size_t index) const;
 
     // Notifies the DevicePermissionsManager for the current extension that
     // access to the device at the given index is now granted.
     void GrantDevicePermission(size_t index);
 
     virtual void Dismissed() = 0;
 
@@ skipping 60 matching lines @@
 
   // Parameters available to the UI implementation.
   scoped_refptr<Prompt> prompt_;
 
   DISALLOW_COPY_AND_ASSIGN(DevicePermissionsPrompt);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DEVICE_PERMISSIONS_PROMPT_H_