This patch caused Chrome to be unable to load any web pages on Chrome OS.

ipc/ipc_tests.cc

Index: ipc/ipc_tests.cc
diff --git a/ipc/ipc_tests.cc b/ipc/ipc_tests.cc
index 7e808a75393db7617412ebe4c47266101a75f9a1..27276814c07182bba0ca37cc7528e95f8091412e 100644
--- a/ipc/ipc_tests.cc
+++ b/ipc/ipc_tests.cc
@@ -251,8 +251,7 @@ TEST_F(IPCChannelTest, ChannelProxyTest) {
   {
     // setup IPC channel proxy
     IPC::ChannelProxy chan(kTestClientChannel, IPC::Channel::MODE_SERVER,
-                           &channel_listener, thread.message_loop_proxy(),
-                           false /* needs_override_peer_pid */);
+                           &channel_listener, thread.message_loop_proxy());
 
     channel_listener.Init(&chan);