remoting: Remove use of ALLOW_THIS_IN_INITIALIZER_LIST.

remoting/host/policy_hack/policy_watcher_linux.cc

Index: remoting/host/policy_hack/policy_watcher_linux.cc
diff --git a/remoting/host/policy_hack/policy_watcher_linux.cc b/remoting/host/policy_hack/policy_watcher_linux.cc
index 4bd82f9ddc1923d0b87cccf672a1d89439c81651..641af9c065cdc07a17450cbb5ae2e3dcd19b992b 100644
--- a/remoting/host/policy_hack/policy_watcher_linux.cc
+++ b/remoting/host/policy_hack/policy_watcher_linux.cc
@@ -50,7 +50,7 @@ class PolicyWatcherLinux : public PolicyWatcher {
                      const base::FilePath& config_dir)
       : PolicyWatcher(task_runner),
         config_dir_(config_dir),
-        ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
+        weak_factory_(this) {
     // Detach the factory because we ensure that only the policy thread ever
     // calls methods on this. Also, the API contract of having to call
     // StopWatching() (which signals completion) after StartWatching()