Cleanup: Remove internal two-phase data pipe all-or-none support.

mojo/edk/system/remote_data_pipe_impl_unittest.cc

Index: mojo/edk/system/remote_data_pipe_impl_unittest.cc
diff --git a/mojo/edk/system/remote_data_pipe_impl_unittest.cc b/mojo/edk/system/remote_data_pipe_impl_unittest.cc
index 6464564397e054ba363b17e069f6a9450bb07f58..23b464fdc1e01d6e23398078acaac5ef03653288 100644
--- a/mojo/edk/system/remote_data_pipe_impl_unittest.cc
+++ b/mojo/edk/system/remote_data_pipe_impl_unittest.cc
@@ -291,11 +291,11 @@ TEST_F(RemoteDataPipeImplTest, SendConsumerDuringTwoPhaseWrite) {
       DataPipeConsumerDispatcher::Create();
   consumer->Init(dp);
 
-  uint32_t num_bytes = static_cast<uint32_t>(10u * sizeof(int32_t));
   void* write_ptr = nullptr;
+  uint32_t num_bytes = 0u;
   EXPECT_EQ(MOJO_RESULT_OK,
             dp->ProducerBeginWriteData(MakeUserPointer(&write_ptr),
-                                       MakeUserPointer(&num_bytes), false));
+                                       MakeUserPointer(&num_bytes)));
   ASSERT_GE(num_bytes, 1u * sizeof(int32_t));
 
   // Write the consumer to MP 0 (port 0). Wait and receive on MP 1 (port 0).
@@ -401,21 +401,21 @@ TEST_F(RemoteDataPipeImplTest, SendConsumerDuringSecondTwoPhaseWrite) {
       DataPipeConsumerDispatcher::Create();
   consumer->Init(dp);
 
-  uint32_t num_bytes = static_cast<uint32_t>(10u * sizeof(int32_t));
   void* write_ptr = nullptr;
+  uint32_t num_bytes = 0u;
   EXPECT_EQ(MOJO_RESULT_OK,
             dp->ProducerBeginWriteData(MakeUserPointer(&write_ptr),
-                                       MakeUserPointer(&num_bytes), false));
+                                       MakeUserPointer(&num_bytes)));
   ASSERT_GE(num_bytes, 1u * sizeof(int32_t));
   *static_cast<int32_t*>(write_ptr) = 123456;
   EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(
                                 static_cast<uint32_t>(1u * sizeof(int32_t))));
 
-  num_bytes = static_cast<uint32_t>(10u * sizeof(int32_t));
   write_ptr = nullptr;
+  num_bytes = 0u;
   EXPECT_EQ(MOJO_RESULT_OK,
             dp->ProducerBeginWriteData(MakeUserPointer(&write_ptr),
-                                       MakeUserPointer(&num_bytes), false));
+                                       MakeUserPointer(&num_bytes)));
   ASSERT_GE(num_bytes, 1u * sizeof(int32_t));
 
   // Write the consumer to MP 0 (port 0). Wait and receive on MP 1 (port 0).