Replace base::SharedMemory read-only methods with GetReadOnlyHandle.

extensions/browser/user_script_loader.cc

Index: extensions/browser/user_script_loader.cc
diff --git a/extensions/browser/user_script_loader.cc b/extensions/browser/user_script_loader.cc
index 6ebe496964e0d23c73c1481ea3d79ffee966d12d..c20f96a6385963bf57d01a3d9c350646bdd811cb 100644
--- a/extensions/browser/user_script_loader.cc
+++ b/extensions/browser/user_script_loader.cc
@@ -332,9 +332,8 @@ std::unique_ptr<base::SharedMemory> UserScriptLoader::Serialize(
   // Copy the pickle to shared memory.
   memcpy(shared_memory.memory(), pickle.data(), pickle.size());
 
-  base::SharedMemoryHandle readonly_handle;
-  if (!shared_memory.ShareReadOnlyToProcess(base::GetCurrentProcessHandle(),
-                                            &readonly_handle))
+  base::SharedMemoryHandle readonly_handle = shared_memory.GetReadOnlyHandle();
+  if (!readonly_handle.IsValid())
     return std::unique_ptr<base::SharedMemory>();
 
   return base::MakeUnique<base::SharedMemory>(readonly_handle,