Change linux nat traversal default for Chromoting.

remoting/host/plugin/policy_hack/nat_policy.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Most of this code is copied from:
 //   src/chrome/browser/policy/asynchronous_policy_loader.{h,cc}
 
 #include "remoting/host/plugin/policy_hack/nat_policy.h"
 
 #include "base/bind.h"
@@ skipping 71 matching lines @@
 
 bool NatPolicy::OnPolicyThread() const {
   return message_loop_proxy_->BelongsToCurrentThread();
 }
 
 void NatPolicy::UpdateNatPolicy(base::DictionaryValue* new_policy) {
   DCHECK(OnPolicyThread());
   bool new_nat_enabled_state = false;
   if (!new_policy->HasKey(kNatPolicyName)) {
     // If unspecified, the default value of this policy is true.
-    //
-    // TODO(dmaclach): Currently defaults to false on Linux until
-    // we have policy in place. http://crbug.com/97689
-#if defined(OS_WIN)
     new_nat_enabled_state = true;
-#elif defined(OS_MACOSX)
-    new_nat_enabled_state = true;
-#elif defined(OS_LINUX)
-    new_nat_enabled_state = false;
-#else
-    // Be conservative for now
-    new_nat_enabled_state = false;
-#endif  // defined(OS_WIN)
   } else {
     // Otherwise, try to parse the value and only change from false if we get
     // a successful read.
     base::Value* value;
     if (new_policy->Get(kNatPolicyName, &value) &&
         value->IsType(base::Value::TYPE_BOOLEAN)) {
       CHECK(value->GetAsBoolean(&new_nat_enabled_state));
     }
   }
 
   if (!first_state_published_ ||
       (new_nat_enabled_state != current_nat_enabled_state_)) {
     first_state_published_ = true;
     current_nat_enabled_state_ = new_nat_enabled_state;
     nat_enabled_cb_.Run(current_nat_enabled_state_);
   }
 }
 
 }  // namespace policy_hack
 }  // namespace remoting