Revert 232412 "Implement Google network speech synthesis."

chrome/browser/extensions/api/system_private/system_private_api.h

 // Copyright (c) 2012 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.
 
 // This extension API contains system-wide preferences and functions that shall
 // be only available to component extensions.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_SYSTEM_PRIVATE_SYSTEM_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_PRIVATE_SYSTEM_PRIVATE_API_H_
 
@@ skipping 21 matching lines @@
   DECLARE_EXTENSION_FUNCTION("systemPrivate.getUpdateStatus",
                              SYSTEMPRIVATE_GETUPDATESTATUS)
 
  protected:
   virtual ~SystemPrivateGetUpdateStatusFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
-// API function which returns the Google API key.
-class SystemPrivateGetApiKeyFunction : public SyncExtensionFunction {
- public:
-  DECLARE_EXTENSION_FUNCTION("systemPrivate.getApiKey", SYSTEMPRIVATE_GETAPIKEY)
-
- protected:
-  virtual ~SystemPrivateGetApiKeyFunction() {}
-
-  // ExtensionFunction:
-  virtual bool RunImpl() OVERRIDE;
-};
-
 // Dispatches systemPrivate.onBrightnessChanged event for extensions.
 void DispatchBrightnessChangedEvent(int brightness, bool user_initiated);
 
 // Dispatches systemPrivate.onVolumeChanged event for extensions.
 void DispatchVolumeChangedEvent(double volume, bool is_volume_muted);
 
 // Dispatches systemPrivate.onScreenChanged event for extensions.
 void DispatchScreenUnlockedEvent();
 
 // Dispatches systemPrivate.onWokeUp event for extensions.
 void DispatchWokeUpEvent();
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_PRIVATE_SYSTEM_PRIVATE_API_H_