Remove Plugin::DocumentCanRequest.

ppapi/native_client/src/trusted/plugin/plugin.h

Index: ppapi/native_client/src/trusted/plugin/plugin.h
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.h b/ppapi/native_client/src/trusted/plugin/plugin.h
index 8b89a882b570e56a07dad82ff50f15820355cb8e..00798c243b33631f3b1ee58baa786a4bc63cd525 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.h
+++ b/ppapi/native_client/src/trusted/plugin/plugin.h
@@ -121,11 +121,6 @@ class Plugin : public pp::Instance {
 
   nacl::DescWrapperFactory* wrapper_factory() const { return wrapper_factory_; }
 
-  // A helper function that indicates if |url| can be requested by the document
-  // under the same-origin policy. Strictly speaking, it may be possible for the
-  // document to request the URL using CORS even if this function returns false.
-  bool DocumentCanRequest(const std::string& url);
-
   const PPB_NaCl_Private* nacl_interface() const { return nacl_interface_; }
   pp::UMAPrivate& uma_interface() { return uma_interface_; }