Fix to bug 75303

ipc/ipc_channel_handle.h

Index: ipc/ipc_channel_handle.h
diff --git a/ipc/ipc_channel_handle.h b/ipc/ipc_channel_handle.h
index 1b9a385abf0cb52d502b26d4e83d51e1993a1d43..a6d4bb8f9feb21efb935b94a8b39d389f6d142d4 100644
--- a/ipc/ipc_channel_handle.h
+++ b/ipc/ipc_channel_handle.h
@@ -30,6 +30,9 @@ struct ChannelHandle {
   // Note that serialization for this object is defined in the ParamTraits
   // template specialization in ipc_message_utils.h.
   ChannelHandle() {}
+  // The name that is passed in should be an absolute path for Posix.
+  // Otherwise there may be a problem in IPC communication between
+  // processes with different working directories.
   ChannelHandle(const std::string& n) : name(n) {}
   ChannelHandle(const char* n) : name(n) {}
 #if defined(OS_POSIX)