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

base/memory/shared_memory_helper.cc

Index: base/memory/shared_memory_helper.cc
diff --git a/base/memory/shared_memory_helper.cc b/base/memory/shared_memory_helper.cc
index 7fbfb7afad5ce5dcc1c73eac497904987c29be05..f13e3fb052690c112df3fd3af76ea7f6c7a2d049 100644
--- a/base/memory/shared_memory_helper.cc
+++ b/base/memory/shared_memory_helper.cc
@@ -48,7 +48,7 @@ bool CreateAnonymousSharedMemory(const SharedMemoryCreateOptions& options,
   path_unlinker.reset(path);
 
   if (options.share_read_only) {
-    // Also open as readonly so that we can ShareReadOnlyToProcess.
+    // Also open as readonly so that we can GetReadOnlyHandle.
     readonly_fd->reset(HANDLE_EINTR(open(path->value().c_str(), O_RDONLY)));
     if (!readonly_fd->is_valid()) {
       DPLOG(ERROR) << "open(\"" << path->value() << "\", O_RDONLY) failed";