Revert of [mojo-edk] Simplify multiprocess pipe bootstrap

mojo/edk/system/multiprocess_message_pipe_unittest.cc

Index: mojo/edk/system/multiprocess_message_pipe_unittest.cc
diff --git a/mojo/edk/system/multiprocess_message_pipe_unittest.cc b/mojo/edk/system/multiprocess_message_pipe_unittest.cc
index ece85a1f001ca7bd2158c38a0732e7a2784fb6a9..00c2ab564d4c3df196c0c93d337e1f99a6430b2e 100644
--- a/mojo/edk/system/multiprocess_message_pipe_unittest.cc
+++ b/mojo/edk/system/multiprocess_message_pipe_unittest.cc
@@ -19,7 +19,6 @@
 #include "base/logging.h"
 #include "base/strings/string_split.h"
 #include "build/build_config.h"
-#include "mojo/edk/embedder/platform_channel_pair.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "mojo/edk/system/handle_signals_state.h"
 #include "mojo/edk/system/test_utils.h"
@@ -1272,44 +1271,6 @@
   END_CHILD()
 }
 
-DEFINE_TEST_CLIENT_TEST_WITH_PIPE(BootstrapMessagePipeAsyncClient,
-                                  MultiprocessMessagePipeTest, parent) {
-  // Receive one end of a platform channel from the parent.
-  MojoHandle channel_handle;
-  EXPECT_EQ("hi", ReadMessageWithHandles(parent, &channel_handle, 1));
-  ScopedPlatformHandle channel;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            edk::PassWrappedPlatformHandle(channel_handle, &channel));
-  ASSERT_TRUE(channel.is_valid());
-
-  // Create a new pipe using our end of the channel.
-  ScopedMessagePipeHandle pipe = edk::CreateMessagePipe(std::move(channel));
-
-  // Ensure that we can read and write on the new pipe.
-  VerifyEcho(pipe.get().value(), "goodbye");
-}
-
-TEST_F(MultiprocessMessagePipeTest, BootstrapMessagePipeAsync) {
-  // Tests that new cross-process message pipes can be created synchronously
-  // using asynchronous negotiation over an arbitrary platform channel.
-  RUN_CHILD_ON_PIPE(BootstrapMessagePipeAsyncClient, child)
-    // Pass one end of a platform channel to the child.
-    PlatformChannelPair platform_channel;
-    MojoHandle client_channel_handle;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              CreatePlatformHandleWrapper(platform_channel.PassClientHandle(),
-                                          &client_channel_handle));
-    WriteMessageWithHandles(child, "hi", &client_channel_handle, 1);
-
-    // Create a new pipe using our end of the channel.
-    ScopedMessagePipeHandle pipe =
-        edk::CreateMessagePipe(platform_channel.PassServerHandle());
-
-    // Ensure that we can read and write on the new pipe.
-    VerifyEcho(pipe.get().value(), "goodbye");
-  END_CHILD()
-}
-
 }  // namespace
 }  // namespace edk
 }  // namespace mojo