Remove Plugin::DocumentCanRequest.

This is no longer used after the removal of FileDownloader from the trusted
plugin.

BUG=

Review URL: https://codereview.chromium.org/560073002

Cr-Commit-Position: refs/heads/master@{#294197}

ppapi/native_client/src/trusted/plugin/plugin.cc

@@ -24,7 +24,6 @@
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_nacl_private.h"
-#include "ppapi/cpp/dev/url_util_dev.h"
 #include "ppapi/cpp/module.h"
 
 #include "ppapi/native_client/src/trusted/plugin/nacl_subprocess.h"
@@ -276,7 +275,6 @@ Plugin::Plugin(PP_Instance pp_instance)
   nexe_file_info_ = kInvalidNaClFileInfo;
 }
 
-
 Plugin::~Plugin() {
   int64_t shutdown_start = NaClGetTimeOfDayMicroseconds();
 
@@ -433,10 +431,4 @@ void Plugin::ReportLoadError(const ErrorInfo& error_info) {
                                    error_info.message().c_str());
 }
 
-bool Plugin::DocumentCanRequest(const std::string& url) {
-  CHECK(pp::Module::Get()->core()->IsMainThread());
-  CHECK(pp::URLUtil_Dev::Get() != NULL);
-  return pp::URLUtil_Dev::Get()->DocumentCanRequest(this, pp::Var(url));
-}
-
 }  // namespace plugin

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_; }