Packaged (CRX) extensions shouldn't be able to get 'dev' interfaces in NaCl.

ppapi/native_client/src/shared/ppapi_proxy/browser_globals.h

 // Copyright (c) 2011 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_GLOBALS_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_GLOBALS_H_
 
 #include "ppapi/c/dev/ppb_cursor_control_dev.h"
 #include "ppapi/c/dev/ppb_find_dev.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
@@ skipping 25 matching lines @@
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ppapi/c/trusted/ppb_graphics_3d_trusted.h"
 #include "ppapi/c/trusted/ppb_image_data_trusted.h"
 
 struct NaClSrpcRpc;
 struct NaClSrpcChannel;
 
 namespace ppapi_proxy {
 
 // These functions handle the browser-side (trusted code) mapping of a browser
-// Instance to instance-specific data, such as the SRPC communication channel.
+// instance to instance-specific data, such as the SRPC communication channel.
 // These functions are called by the in-browser (trusted) plugin code, and are
 // always called from the main (foreground, UI, ...) thread. As such, they are
 // not thread-safe (they do not need to be).
 
 // BrowserPpp keeps browser side PPP_Instance specific information, such as the
 // channel used to talk to the instance.
 class BrowserPpp;
 
-// Returns true if the PPAPI Developer interfaces are enabled.
-// To enable, set the environment variable NACL_ENABLE_PPAPI_DEV=1
-// Note: Developer interfaces are _not_ enabled by default.
-bool AreDevInterfacesEnabled();
-
 // Associate a particular BrowserPpp with a PP_Instance value.  This allows the
 // browser side to look up information it needs to communicate with the stub.
 void SetBrowserPppForInstance(PP_Instance instance,
                               BrowserPpp* browser_ppp);
 // When an instance is destroyed, this is called to remove the association, as
 // the stub will be destroyed by a call to Shutdown.
 void UnsetBrowserPppForInstance(PP_Instance instance);
 // Gets the BrowserPpp information remembered for a particular instance.
 BrowserPpp* LookupBrowserPppForInstance(PP_Instance instance);
 
@@ skipping 58 matching lines @@
 const PPB_WheelInputEvent* PPBWheelInputEventInterface();
 const PPB_Widget_Dev* PPBWidgetInterface();
 const PPB_Zoom_Dev* PPBZoomInterface();
 
 // PPAPI constants used in the proxy.
 extern const PP_Resource kInvalidResourceId;
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_GLOBALS_H_