Remove support for "all or none" two-phase data pipe read/write.

mojo/public/go/bindings/invalid_handle.go

Index: mojo/public/go/bindings/invalid_handle.go
diff --git a/mojo/public/go/bindings/invalid_handle.go b/mojo/public/go/bindings/invalid_handle.go
index 1acc645dd6f0a81aee05a67c2d47156f6a0f91dd..64d46451ef316c60243830a6ecf7e9b3a0d9c436 100644
--- a/mojo/public/go/bindings/invalid_handle.go
+++ b/mojo/public/go/bindings/invalid_handle.go
@@ -56,7 +56,7 @@ func (h *InvalidHandle) ReadData(flags system.MojoReadDataFlags) (system.MojoRes
 	return system.MOJO_RESULT_INVALID_ARGUMENT, nil
 }
 
-func (h *InvalidHandle) BeginReadData(numBytes int, flags system.MojoReadDataFlags) (system.MojoResult, []byte) {
+func (h *InvalidHandle) BeginReadData(flags system.MojoReadDataFlags) (system.MojoResult, []byte) {
 	return system.MOJO_RESULT_INVALID_ARGUMENT, nil
 }
 
@@ -68,7 +68,7 @@ func (h *InvalidHandle) WriteData(data []byte, flags system.MojoWriteDataFlags)
 	return system.MOJO_RESULT_INVALID_ARGUMENT, 0
 }
 
-func (h *InvalidHandle) BeginWriteData(numBytes int, flags system.MojoWriteDataFlags) (system.MojoResult, []byte) {
+func (h *InvalidHandle) BeginWriteData(flags system.MojoWriteDataFlags) (system.MojoResult, []byte) {
 	return system.MOJO_RESULT_INVALID_ARGUMENT, nil
 }