ChildProcessSecurityPolicy: Port FileAPIMessageFilter to use new checks

content/renderer/pepper/pepper_file_io_host.cc

Index: content/renderer/pepper/pepper_file_io_host.cc
diff --git a/content/renderer/pepper/pepper_file_io_host.cc b/content/renderer/pepper/pepper_file_io_host.cc
index d472da2196d3bba286dec95fe17e8bd02ce6a973..1690e2e3d0de4a8b2030214989e89ead61c31ed9 100644
--- a/content/renderer/pepper/pepper_file_io_host.cc
+++ b/content/renderer/pepper/pepper_file_io_host.cc
@@ -220,14 +220,9 @@ int32_t PepperFileIOHost::OnHostMsgOpen(
   if (rv != PP_OK)
     return rv;
 
-  // TODO(tommycli): Eventually just pass the Pepper flags straight to the
-  // FileSystemDispatcher so it can handle doing the security check.
-  int platform_file_flags = 0;
   open_flags_ = open_flags;
-  if (!ppapi::PepperFileOpenFlagsToPlatformFileFlags(open_flags,
-                                                     &platform_file_flags)) {
+  if (!ppapi::PepperFileOpenFlagsToPlatformFileFlags(open_flags, NULL))
     return PP_ERROR_BADARGUMENT;
-  }
 
   EnterResourceNoLock<PPB_FileRef_API> enter(file_ref_resource, true);
   if (enter.failed())
@@ -252,8 +247,8 @@ int32_t PepperFileIOHost::OnHostMsgOpen(
         &PepperFileIOHost::ExecutePlatformOpenFileSystemURLCallback,
         weak_factory_.GetWeakPtr(),
         context->MakeReplyMessageContext());
-    file_system_dispatcher->OpenFile(
-        file_system_url_, platform_file_flags,
+    file_system_dispatcher->OpenPepperFile(
+        file_system_url_, open_flags,
         base::Bind(&DidOpenFileSystemURL, callback),
         base::Bind(&DidFailOpenFileSystemURL, callback));
   } else {