Add mojo::edk::ClosePeerConnection.

mojo/edk/test/multiprocess_test_helper.h

Index: mojo/edk/test/multiprocess_test_helper.h
diff --git a/mojo/edk/test/multiprocess_test_helper.h b/mojo/edk/test/multiprocess_test_helper.h
index 5226a95352e609c234c75cf52e3391fc2a1eff5a..942a29b90f2087830a550365db2dbf38026cbd5e 100644
--- a/mojo/edk/test/multiprocess_test_helper.h
+++ b/mojo/edk/test/multiprocess_test_helper.h
@@ -66,6 +66,8 @@ class MultiprocessTestHelper {
     process_error_callback_ = callback;
   }
 
+  void ClosePeerConnection();
+
   // Wait for the child process to terminate.
   // Returns the exit code of the child process. Note that, though it's declared
   // to be an |int|, the exit code is subject to mangling by the OS. E.g., we
@@ -96,6 +98,8 @@ class MultiprocessTestHelper {
 
   ProcessErrorCallback process_error_callback_;
 
+  std::string peer_token_;
+
   DISALLOW_COPY_AND_ASSIGN(MultiprocessTestHelper);
 };