Fix remoting_unittests that are failing on 32-bit linux

remoting/host/security_key/remote_security_key_ipc_client_unittest.cc

Index: remoting/host/security_key/remote_security_key_ipc_client_unittest.cc
diff --git a/remoting/host/security_key/remote_security_key_ipc_client_unittest.cc b/remoting/host/security_key/remote_security_key_ipc_client_unittest.cc
index b37d4f411f3348fd00762d3aa4a07c3e5e4409a9..ed48b4081ae34dffde2a1eb287af07d94424f63e 100644
--- a/remoting/host/security_key/remote_security_key_ipc_client_unittest.cc
+++ b/remoting/host/security_key/remote_security_key_ipc_client_unittest.cc
@@ -14,6 +14,7 @@
 #include "ipc/ipc_channel.h"
 #include "remoting/host/security_key/fake_ipc_gnubby_auth_handler.h"
 #include "remoting/host/security_key/fake_remote_security_key_ipc_server.h"
+#include "remoting/host/security_key/remote_security_key_ipc_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ -147,7 +148,8 @@ void RemoteSecurityKeyIpcClientTest::ClientMessageReceived(
 }
 
 std::string RemoteSecurityKeyIpcClientTest::GenerateUniqueTestChannelName() {
-  return kValidIpcChannelName + IPC::Channel::GenerateUniqueRandomChannelID();
+  return GetChannelNamePathPrefixForTest() + kValidIpcChannelName +
+         IPC::Channel::GenerateUniqueRandomChannelID();
 }
 
 void RemoteSecurityKeyIpcClientTest::EstablishConnection(bool expect_success) {